Graded exposure hierarchy

1. Introduction

Version followed: Wolpe's anxiety hierarchy and 0–100 SUD scale (Wolpe 1990, The Practice of Behavior Therapy, 4th ed., as summarised by Athabasca University) as the base procedure; graded in vivo exposure as described for specific phobia by Div 12 and for self-help by Anxiety Canada (the "traditional", habituation-guided version); updated with the inhibitory-learning modifications of Craske et al. (2014). Where the two versions disagree (when to move up, whether to follow the ladder in order), both are given and labelled.

What it is. A graded exposure hierarchy (fear ladder, anxiety hierarchy) is not a stand-alone therapy but a core procedure used inside many exposure-based treatments: systematic desensitisation, in vivo exposure for phobias, one-session treatment (OST), prolonged exposure (PE), exposure and response prevention (ERP), interoceptive exposure for panic, and child CBT programmes such as Coping Cat. The clinician and client list feared situations, objects, images or sensations, rate each with a distress scale, order them from least to most frightening, and then approach them step by step in planned, repeated practice until avoidance is replaced by approach. [source: Div 12; Wikipedia, Exposure therapy; Athabasca/Wolpe]

How change happens. Avoidance (including partial avoidance such as drinking before a flight) maintains fear because it stops the person learning that fear fades, that they can tolerate it, and that the feared outcome does not occur or is less bad than predicted [source: Div 12]. Wolpe's original account was reciprocal inhibition / counterconditioning: pairing graded fear cues with an incompatible state (relaxation) [source: Athabasca/Wolpe]. The traditional exposure account emphasises habituation: staying until fear falls, step by step [source: Anxiety Canada]. The current dominant account is inhibitory learning: the old fear memory stays intact, and exposure builds a competing "safe" memory that must be made strong and retrievable; fear reduction is a by-product, not the goal [source: Craske et al. 2014; Wikipedia]. The ladder's job under all three accounts is to make approach possible and keep the client engaged.

2. Framework

The hierarchy is used across six phases. Phases 1–3 usually take 1–3 sessions; the length of phase 5 depends on the problem and format. [synthesis, organising the sources below]

Phase 1. Assessment and functional analysis. Goal: identify the feared stimuli, the feared consequences (what the client predicts will happen), the avoidance and safety behaviours, and a baseline (behavioural approach test, SUDS, questionnaires). In OST for youth, an assessment phase is followed by a 45-minute session that builds rapport and does a brief cognitive-behavioural analysis of the phobia [source: Ollendick et al. 2010]. Wolpe used his Fear Survey Schedule to help identify fears [source: Athabasca/Wolpe].

Phase 2. Rationale, consent and planning. Goal: the client understands why avoidance maintains fear, agrees that exposure will involve deliberate discomfort, and has a say in pacing. [source: Div 12 rationale; consent framing is synthesis]

Phase 3. Hierarchy construction. Goal: a written ladder of about 10–20 items (some sources say up to 30), grouped by theme, rated, ordered, with roughly 5–10 SUD points between adjacent items [source: Athabasca/Wolpe, citing Miltenberger 1997, Martin & Pear 1998]. Anxiety Canada's self-help version uses a 0–10 scale and asks for steps that are doable now, moderate, and too hard for now [source: Anxiety Canada]. Under inhibitory learning, the ladder is also annotated with the feared outcome each item tests [source: Craske et al. 2014].

Phase 4. Preparatory skills (only where indicated). Relaxation training for classical systematic desensitisation (about six lessons, roughly a third of each session, plus twice-daily home practice) [source: Athabasca/Wolpe]; applied tension for blood-injection-injury (BII) phobia with a fainting history (practise for about a week before exposure in one NHS leaflet) [source: Guy's and St Thomas'/LPT leaflet; Div 12]. Plain in vivo exposure needs no preparatory skill. [synthesis: do not add relaxation by default; Div 12 notes systematic desensitisation takes longer and is not first-line when in vivo exposure is acceptable]

Phase 5. Graded exposure practice. Goal: repeated, planned, prolonged approach to ladder items, first therapist-guided in session, then self-directed between sessions. Typical formats:

Specific phobia, in vivo: a few hours in total, either one long session (about 3 hours, as in OST) or 3–8 sessions of 1–1.5 hours [source: Div 12; Ollendick et al. 2010].
Systematic desensitisation (imaginal): desensitisation segments of 15–30 minutes, 8–10 scene presentations early on rising to 30–50, usually 3–4 presentations per scene; at least weekly is recommended; total length ranges from one session to about 100 [source: Athabasca/Wolpe].
Interoceptive ladder (panic): exercises practised in session and as daily homework [source: Schmidt & Trakowski 2004].
Child CBT (Coping Cat): 16 weekly 50-minute sessions, with weekly "Show That I Can" homework tasks; parents meet in sessions 4 and 9 and as needed for exposure tasks [source: CEBC Coping Cat]. That the second half of the programme is devoted to exposure is from general knowledge of the manual [uncertain].

Phase 6. Consolidation and relapse prevention. Goal: keep practising after gains, re-rate the ladder, plan ongoing "maintenance" exposures and responses to return of fear [source: Anxiety Canada; Craske et al. 2014 on retrieval cues].

Criteria for moving up the ladder (the main point of version difference)

Wolpe, systematic desensitisation: repeat a scene until the SUD rating reaches zero, then move one item up; if the last scene did not reach zero, resume it next session [source: Athabasca/Wolpe].
Traditional graded in vivo (Anxiety Canada): stay in the situation until fear drops by about half (for example 6/10 to 3/10), and move up when the client can enter the situation several separate times with little anxiety [source: Anxiety Canada].
Inhibitory learning (Craske et al. 2014): exposure length is set by the expectancy test (long enough or intense enough that the feared outcome would have happened), not by fear decline; within-session fear decline is not used as the stopping or advancement rule; items may be taken out of order, though starting with a lower item reduces refusal [source: Craske et al. 2014].
OST: the client signals readiness for the next step; the session ends when the top step is reached, or at the time limit, or when there is no significant avoidance and little anxiety [source: Wannemueller et al. 2016; Ollendick et al. 2010].
[synthesis] Practical blend for most clinicians: advance when (a) the client has done the step without safety behaviours, (b) the specific prediction attached to it has been tested and disconfirmed, and (c) the client is willing to do the next one. Treat fear ratings as information, not as a gate.

Ending treatment. [synthesis] End when the client can do the top items (or the goal behaviour that matters in their life) without avoidance or safety behaviours, across more than one context, and has a written maintenance plan. Re-test with the same behavioural approach test used at baseline.

3. Guiding principles

Avoidance maintains fear; approach treats it. Every session should include actual approach, not just talk about it. [source: Div 12]
Partial avoidance counts as avoidance. Entering the situation while using a crutch (alcohol, a companion, distraction) undermines learning; look for it in every item. [source: Div 12; Craske et al. 2014]
Individual tailoring. Items and their order follow the client's own ratings, not what seems logical to the therapist. [source: Athabasca/Wolpe]
Start low enough to be accepted, climb fast enough to matter. Begin with mild items to prevent refusal; do not stall on easy items. [source: Craske et al. 2014; Div 12; over-caution risk from Farrell et al. 2013]
Collaboration and control. The client agrees each step; in graded exposure the client can stop at any time. [source: Wikipedia] Practical meaning: no surprises, but agree in advance to some unpredictability if using variability. [source: Craske et al. 2014]
Planned, prolonged, repeated. Exposures are scheduled in advance, long enough, and repeated often; frequent practice works faster. [source: Anxiety Canada]
Specify the prediction. The client names a concrete feared outcome for each exposure (not just "I'll get anxious") and rates how likely it is. [source: Craske et al. 2014]
Fear is expected and allowed. Anxiety during exposure is normal; the aim is learning, not calm. [source: Anxiety Canada; Craske et al. 2014]
Drop safety signals and behaviours. Remove them at once if the client agrees; phase them out gradually only to prevent dropout. [source: Craske et al. 2014]
Vary it. Different stimuli, settings, times, durations and companions (or none) build learning that transfers. [source: Craske et al. 2014]
Consolidate after, not during. Hold cognitive restructuring and reassurance until after the exposure, then review what was learned. [source: Craske et al. 2014]
Measure every time. Record SUDS (and expectancy) before, during and after, and keep the records; SUDS compare within a client, never across clients. [source: Athabasca/Wolpe; Anxiety Canada]
Ladders are living documents. Add intermediate items when a step will not move; re-rate the whole ladder periodically. [source: Athabasca/Wolpe; Anxiety Canada]
Therapist beliefs shape delivery. Therapists who hold negative beliefs about exposure build less ambitious ladders and try to minimise client anxiety. Check your own hesitancy before softening a plan. [source: Farrell et al. 2013]
Real danger is excluded. Ladder items must be objectively safe or at everyday levels of risk; the work targets unrealistic fear, not prudent caution. [synthesis]
Reward effort (especially with children). Plan rewards and self-praise for brave behaviour. [source: Anxiety Canada; CEBC Coping Cat]

4. Intervention inventory

Grouped as: A. assessment and set-up (4.1–4.6); B. exposure delivery formats (4.7–4.15); C. inhibitory-learning enhancers (4.16–4.22); D. between-session work and maintenance (4.23–4.27). All example wording is illustrative unless quoted and cited. No licensed scale items are reproduced.

A. Assessment and set-up

4.1 Functional assessment of fear and avoidance

Purpose / when: First 1–2 sessions, and again whenever a step stalls. Maps what is feared, what the client predicts will happen, how they avoid, and what keeps them "safe". [source: Div 12; Ollendick et al. 2010; Craske et al. 2014]
Steps: (1) Ask for recent concrete episodes; for each, the trigger, sensations, thoughts, and what the client did. (2) Ask for the feared outcome in concrete terms: what exactly would happen, to whom, how fast. (3) List overt avoidance (situations not entered), escape (leaving early), and subtle avoidance or safety behaviours (companions, phones, medication carried, distraction, checking exits, alcohol beforehand, earphones). (4) Identify which dimensions make fear go up or down (distance, duration, size, being alone, time of day, ease of escape). (5) Screen for conditions that change the plan: fainting history (BII), medical conditions relevant to physical exercises, active suicidality, substance misuse, psychosis or dissociation. [steps 4–5 synthesis] (6) Optionally use a fear survey questionnaire to catch fears not raised spontaneously (Wolpe's Fear Survey Schedule is one; items not reproduced). [source: Athabasca/Wolpe]
Example language (illustrative): "When you picture being in the lift and the doors close, what do you expect to happen next?" "What do you do, even in small ways, to make it more bearable?"
Watch for: Vague predictions ("something bad"), which make later exposures hard to design; safety behaviours the client does not see as avoidance. Working if you can write one sentence per theme: cue, feared outcome, avoidance, safety behaviour.

4.2 Behavioural approach test (BAT)

Purpose / when: Baseline and outcome measure of how close the client can actually get. Used before and after OST and many phobia trials. [source: Wannemueller et al. 2016; Ollendick et al. 2010]
Steps: (1) Define a graded series of approach steps toward the stimulus (for example, enter room, approach to set distances, touch container, touch stimulus). (2) Ask the client to go as far as they are willing; no pressure. (3) Record the furthest step and peak SUDS. (4) Repeat the same BAT at the end of treatment and at follow-up. [procedure detail synthesis; the sources name the BAT without a step list]
Example language (illustrative): "This isn't treatment yet. I just want to see how far you can comfortably go today. Stop whenever you want."
Watch for: Clients over-performing because the therapist is present (the therapist can be a safety signal). Working if post-treatment BAT steps rise and peak SUDS falls.

4.3 Teaching the distress scale (SUDS / fear thermometer)

Purpose / when: Before building the ladder. Gives a common language for rating items and tracking change. [source: Athabasca/Wolpe; Anxiety Canada]
Steps: (1) Explain a 0–100 scale: 0 = completely calm, 100 = the worst anxiety the client can imagine (Wolpe). For children or self-help use a 0–10 scale or a drawn thermometer (Anxiety Canada uses 0–10). (2) Anchor it with the client's own examples (what is a 20, a 50, a 90 for them?). (3) Stress that ratings are personal and only compared within the same person over time. (4) Use the same scale before, during (peak) and after every exposure. [source: Athabasca/Wolpe; Anxiety Canada; anchoring step is synthesis]
Example language (illustrative): "If 0 is lying in a warm bath and 100 is the most frightened you've ever been or could imagine, where would standing at the top of an escalator be?"
Watch for: Clients who give only extremes (0 or 100): re-anchor with more personal examples. Clients who confuse intensity of sensation with fear (common in panic): rate them separately (see 4.13). [source: Schmidt & Trakowski 2004 for the separation]

4.4 Psychoeducation, rationale and consent

Purpose / when: Before the first exposure; repeated whenever motivation dips. [source: Div 12 rationale; Wannemueller et al. 2016 note psychoeducation as part of OST]
Steps: (1) Draw the avoidance cycle from the client's own example: fear → avoidance → short-term relief → no chance to learn → fear stays or grows. (2) Explain that exposure means planned, deliberate contact with what is feared, starting with easier steps, and that anxiety is expected. (3) Explain what the client will learn (that the feared outcome is unlikely or bearable, that fear can be tolerated). (4) Describe the ladder, the client's control over pace, and that they can stop, while explaining that stopping early or using safety behaviours reduces what they learn. (5) Obtain explicit agreement; for interoceptive or prolonged exposures, describe likely sensations and after-effects in advance. (6) For children, give parents the rationale and procedures too. [source: Div 12; Ollendick et al. 2010; consent steps are synthesis]
Example language (illustrative): "Every time you avoid the lift, your brain files it as 'that was close'. We're going to give it new evidence, a step at a time, at a pace you agree to."
Watch for: Agreement that is only verbal. Working if the client can explain the rationale back in their own words.

4.5 Generating the fear list

Purpose / when: Raw material for the ladder. [source: Athabasca/Wolpe; Anxiety Canada]
Steps: (1) Brainstorm every situation, object, image, thought or sensation that triggers fear or avoidance, including ones the client has never experienced but would expect to fear (Wolpe). (2) Group items into themes; make a separate list per theme. (3) Define a valued goal at the top for each theme (for example, flying to see family) and break it into smaller steps. (4) Generate variants of each situation by changing one dimension at a time (duration, time of day, distance, company, setting) to fill gaps. [source: Athabasca/Wolpe; Anxiety Canada]
Example language (illustrative): "Let's not judge them yet; just list everything about dogs that makes you tense, from photos to a big dog off its lead."
Watch for: Lists that skip the middle range; items that are not concrete enough to schedule.

4.6 Building and ordering the hierarchy (fear ladder)

Purpose / when: After 4.5; revisited throughout. [source: Athabasca/Wolpe; Anxiety Canada; Craske et al. 2014]
Steps: (1) Rate each item with SUDS. (2) Order from least to most distressing by the client's ratings. (3) Check spacing: adjacent items roughly 5–10 SUDS apart on a 0–100 scale; too close wastes time, too far stalls progress. (4) Aim for about 10–20 items per theme (some sources accept up to 30). (5) Make sure the ladder includes items doable now, moderate items, and items that feel too hard for now. (6) If no middle items exist, vary duration, time, setting or company to create them. (7) [Inhibitory-learning version] Next to each item write the specific feared outcome it tests and the client's 0–100 likelihood rating; items can also be graded by how strongly they test the prediction (duration, intensity). (8) Write it down and give the client a copy. [source: Athabasca/Wolpe; Anxiety Canada; Craske et al. 2014; step 8 synthesis]
Example language (illustrative): "Holding the spider jar is a 60 and touching the spider is a 90. That's a big jump. What might sit around 70 or 75?"
Watch for: The therapist's sense of logical order overriding the client's ratings; ladders that top out below the client's real goal (a sign of therapist or client caution; see Farrell et al. 2013). Working if the ladder spans the full range and reaches the goal behaviour.

B. Exposure delivery formats

4.7 Therapist-guided graded in vivo exposure (core procedure)

Purpose / when: The default way of using the ladder for situational and object fears; first-line for specific phobia over systematic desensitisation. [source: Div 12]
Safety and consent before starting: Confirm the item is objectively safe; screen out or postpone during acute suicidality, intoxication, acute psychosis or medical instability [synthesis]; confirm informed agreement to this specific step and its planned length; agree a stop signal; with children, involve parents in planning. [consent elements synthesis; parent information from Ollendick et al. 2010]
Steps (traditional version): (1) Pick the lowest item not yet mastered (a mild, accepted step). (2) Record pre-exposure SUDS. (3) Enter the situation and stay; for situations that can be sustained, stay until anxiety clearly drops (Anxiety Canada gives about 20–30 minutes as an example, or about a 50% fall); for brief situations, "loop" them by repeating a set number of times. (4) Take SUDS at intervals and at peak. (5) Record post-exposure SUDS and what was learned. (6) Repeat the same step on several separate occasions; move up when it produces little anxiety. [source: Anxiety Canada]
Steps (inhibitory-learning modifications): at step 2 also record the specific prediction and its likelihood; at step 3 set the length by what would test the prediction, not by SUDS falling; drop safety behaviours; afterwards review the prediction (see 4.22). [source: Craske et al. 2014]
Example language (illustrative): "You've said you'll faint if you stand in the crowded carriage for three stops. Let's do four, without holding the pole. Rate me your fear every stop."
Watch for: Covert escape (looking at the phone, mental distraction), therapist reassurance, ending the session at peak because the therapist is uncomfortable. Working if the client attempts higher items, predictions weaken across trials, and avoidance outside sessions drops.

4.8 Participant modelling / guided mastery

Purpose / when: When the client cannot begin an item alone; standard in OST and phobia treatment, where the therapist demonstrates each step. [source: Div 12; Wannemueller et al. 2016; Ollendick et al. 2010; Bandura et al. 1969 and Williams 1990 cited by Div 12]
Steps: (1) Therapist performs the step calmly while the client watches (for example, lets the spider walk on the therapist's hand). (2) Therapist describes what they are doing and what happens. (3) Client does a smaller version with the therapist's help (hand next to or on the therapist's hand). (4) Therapist gradually withdraws physical help, then presence, until the client does it alone. (5) Praise approach. [source: Ollendick et al. 2010 "modeled and coached"; Wannemueller et al. 2016; fading sequence synthesis]
Example language (illustrative): "Watch what I do and notice what the spider does. Now put your hand next to mine. Good. Now I'll move mine away."
Watch for: The therapist's hand or presence becoming a safety signal; build in a solo repetition before advancing. Working if the client completes the step without contact or proximity aids.

4.9 Graded imaginal exposure

Purpose / when: When items cannot be arranged in real life, for feared thoughts, images and memories, or as a bridge to in vivo work. [source: Wikipedia; Div 12]
Steps: (1) Write a short scene for each ladder item in the present tense with sensory detail and the feared outcome included where relevant. (2) Client closes eyes and imagines the scene, signalling when it is vivid. (3) Hold the scene for the agreed time; take SUDS. (4) Repeat until the agreed criterion, then move to the next scene. (5) Follow with in vivo exposure where possible to check transfer. [source: Athabasca/Wolpe for scene presentation and generalisation check; scene-writing detail synthesis]
Example language (illustrative): "You're at the gate. They call your row. You stand, pick up your bag, and walk toward the tunnel. Notice your heart. What's your rating?"
Watch for: Low vividness (rehearse with a neutral control scene first), covert scene-switching. For trauma memories follow the relevant protocol (PE), not this generic version.

4.10 Progressive (deep) muscle relaxation training, for systematic desensitisation

Purpose / when: Only when using classical systematic desensitisation, where relaxation is the competing response. Wolpe used an abbreviated form of Jacobson's method. [source: Athabasca/Wolpe]
Steps: (1) Teach alternate tensing and releasing of muscle groups in an orderly sequence (arms, face, jaw, eyes, neck and shoulders, back, abdomen and chest, legs) to learn the difference between tension and relaxation. (2) Spend about a third of each session on it over roughly six lessons. (3) Home practice twice daily, 10–15 minutes. (4) Shorten to a brief cue-based induction once the client can relax deeply. Alternatives Wolpe accepted include autogenic training, meditation or biofeedback, and non-relaxation competing responses such as humour or assertive behaviour. [source: Athabasca/Wolpe]
Example language (illustrative): "Make a fist with your right hand, hold it, notice the tension... and let go. Notice the difference."
Watch for: Relaxation used as a safety behaviour during in vivo work. Wolpe himself did not regard relaxation as indispensable. [source: Athabasca/Wolpe]

4.11 Systematic desensitisation proper (Wolpe)

Purpose / when: Imaginal hierarchy paired with relaxation. Slower than in vivo exposure; use when in vivo exposure is unacceptable or impossible. [source: Div 12; Athabasca/Wolpe]
Steps: (1) Induce deep relaxation. (2) Present a neutral control scene to check visualisation. (3) Present the lowest hierarchy item; client raises a finger when the scene is clear. (4) Hold about 5–7 seconds, stop, ask for SUDS. (5) Relax for 10–30 seconds with relaxation cues. (6) Repeat the scene until SUDS reaches 0, then move up one item. (7) If the client becomes very anxious, stop the scene and return to relaxation; if an item does not fall, shorten the exposure, hold the item below for longer (for example 20 seconds), or add intermediate items. (8) Desensitisation segments of 15–30 minutes; up to four hierarchies per session; end on a success; keep records. (9) Next session: resume the last scene if it did not reach 0, otherwise start one up (some authors start with the last fully desensitised scene). (10) Check gains in the real situation; add in vivo exposure if they do not transfer. [source: Athabasca/Wolpe, citing Wolpe 1990, Martin & Pear 1998, Sarafino 1996, Miltenberger 1997]
Example language (illustrative): "Stay relaxed and picture yourself reading the exam timetable on the noticeboard. Raise your finger when it's clear... Stop the scene. Rating?"
Watch for: Lack of transfer to real life. Working if SUDS reaches 0 on successive items and real-world approach increases.

4.12 Applied tension (BII phobia with fainting)

Purpose / when: Blood-injection-injury phobia where the client has fainted or nearly fainted; counters the blood-pressure drop. Taught before exposure, then used during it. [source: Div 12; Guy's and St Thomas' leaflet; Öst & Sterner 1987 cited]
Steps: (1) Seated, tense arm, upper-body and leg muscles for about 10–15 seconds, until warmth rises in the face. (2) Release and sit normally for about 20–30 seconds. (3) Repeat to five cycles. (4) Practise three times a day for about a week. (5) Then begin a BII ladder (for example thinking about an injection → talking about it → photos → video → watching someone else → touching then holding a needle → having an injection), using tension at signs of faintness. [source: Guy's and St Thomas' leaflet]
Example language (illustrative): "As soon as you notice light-headedness, tense arms, chest and legs together and hold until your face feels warm."
Watch for: Headaches (avoid tensing face and head); caution with body areas affected by health problems. [source: leaflet] Keep the client seated or lying during early BII items. [synthesis]

4.13 Interoceptive exposure ladder (feared bodily sensations)

Purpose / when: Panic disorder and other presentations where bodily sensations are the feared cue; future direction for claustrophobia. [source: Wikipedia; Div 12; Schmidt & Trakowski 2004]
Medical screening and consent: Obtain medical clearance and adapt or omit exercises for cardiac, respiratory, seizure, neck or back conditions and pregnancy [synthesis; the cited source does not describe screening]; use a spotter for spinning; warn that sensations may persist briefly afterwards; substitute exercises for physical limitations. [source: Schmidt & Trakowski 2004]
Steps: (1) Assessment: run a standard set of brief exercises (in that source: head shaking, head between legs, running in place, breath holding, spinning, push-ups, hyperventilating, breathing through a thin straw), each for a short fixed time. (2) After each, rate sensation intensity, anxiety and similarity to panic, each 0–10, keeping sensation and fear separate. (3) Order the fear-provoking exercises into a ladder. (4) Practise each repeatedly in session (shorten an exercise to target moderate anxiety); then daily homework. (5) If the client "cheats" with reduced effort, repeat, extend or substitute. (6) Move to naturalistic activities that produce the same sensations (for example caffeine, heat, exercise). [source: Schmidt & Trakowski 2004; naturalistic step partly synthesis] (7) [inhibitory-learning version] Combine sensations, for example breathlessness plus racing heart plus dizziness (deepened extinction). [source: Craske et al. 2014]
Example language (illustrative): "Breathe fast and deep through your mouth until I say stop. Then tell me three numbers: how strong the sensations were, how anxious you were, and how much it felt like a panic attack."
Watch for: Partial effort; sitting near the door; clients who rate high similarity but low anxiety in session may need to practise alone. Working if anxiety on the first trial of an exercise approaches zero across sessions. [source: Schmidt & Trakowski 2004]

4.14 Virtual reality (VR) exposure

Purpose / when: When in vivo items are impractical, costly or hard to grade (flying, heights). Better supported for flying and heights than other subtypes. [source: Div 12]
Steps: (1) Build the ladder from the scenarios and settings the VR system offers (for example boarding, takeoff, turbulence). (2) Run each scenario as an in vivo item, with SUDS and predictions. (3) Move to real-world items as soon as feasible. [steps 1 and 3 synthesis]
Example language (illustrative): "In this run the plane will take off and hit some turbulence. What do you expect will happen to you?"
Watch for: Simulator sickness; learning that does not transfer. [synthesis]

4.15 One-session treatment (OST) format

Purpose / when: Specific phobias in adults and youth; the whole ladder is worked through in one session of up to about 3 hours. [source: Ollendick et al. 2010; Wannemueller et al. 2016; Öst 1989 cited]
Steps: (1) Assessment, then a short pre-session (about 45 minutes in the youth trial) for rapport and a cognitive-behavioural analysis of the phobia. (2) In the main session, graduated in vivo exposure is organised as a series of behavioural tests; the therapist models and coaches interaction, challenges the client's beliefs about the stimulus in its presence, and reinforces approach. (3) The client signals readiness for the next step. (4) End when the top step is reached or the time limit is met; in the youth trial a few sessions ended early when avoidance and anxiety were minimal. (5) Parents (for children) are informed of the rationale and procedures. [source: Ollendick et al. 2010; Wannemueller et al. 2016] Post-session self-exposure instructions are in the manual (Öst & Ollendick 2001), which is not drawn on here. [uncertain]
Example language (illustrative): "You said the dog will bite if you stand within a metre. Let's test that right now with me beside you."
Watch for: Fatigue in long sessions; book enough time to finish on a success.

C. Inhibitory-learning enhancers (Craske et al. 2014)

These modify how ladder items are chosen and run. Authors present them as evidence-informed strategies, several with mainly analogue support. [source: Craske et al. 2014]

4.16 Expectancy testing (expectancy violation)

Purpose / when: Every exposure. Designs each item to contradict the client's prediction as strongly as possible. [source: Craske et al. 2014]
Steps: (1) Before the exposure ask what exactly the client fears will happen and how likely it is (0–100). (2) Ask "what do you need to learn" from this exposure (Craske et al. 2014). (3) Set the duration or intensity so that the prediction is properly tested (in the article's OCD example, the exposure lasted as long as the client predicted it would take for harm to occur). (4) Run the exposure without reassurance or cognitive restructuring. (5) Afterwards, re-rate the likelihood and review (4.22). [source: Craske et al. 2014]
Example language (illustrative): "You expect people will stare and laugh if you drop your keys. How likely, 0 to 100? So we'll drop them three times in the busy foyer and count who laughs."
Watch for: Predictions about anxiety itself ("I'll be anxious") which the exposure cannot disconfirm; reshape into a testable outcome, or into a tolerance prediction ("I won't be able to stand it"). [reshaping is synthesis] Working if likelihood ratings drop across trials.

4.17 Removing safety signals and safety behaviours

Purpose / when: Once identified (4.1); ideally from the first exposure. [source: Craske et al. 2014; Div 12]
Steps: (1) List the client's safety signals (companion, phone, medication, water, food) and behaviours (distraction, earphones, reading, holding on). (2) Explain how they block learning ("I only survived because…"). (3) Remove them immediately if the client agrees; otherwise add "without X" as explicit ladder steps, phasing out only to reduce dropout risk. (4) Check for replacements (a new subtle safety behaviour). [source: Craske et al. 2014; step 4 synthesis]
Example language (illustrative): "If you go with the pills in your pocket, part of you will credit the pills. This time, how about leaving them at the reception desk?"
Watch for: The therapist as a safety signal: include solo practice (in the article, a dog-phobic client practised alone so friends were not safety signals). [source: Craske et al. 2014]

4.18 Variability and multiple contexts

Purpose / when: Once the client is engaged, to make learning more durable and transferable. [source: Craske et al. 2014]
Steps: (1) Vary stimuli (different dogs, sizes), duration, intensity and timing between sessions, including progressively longer gaps. (2) Take items out of strict order once some lower items are done (the article describes exposure to hierarchy items "in random order, without regard to fear levels"); start with a lower item to avoid refusal. (3) Practise in different settings, alone, at different times and days. (4) Agree in advance that lengths and order will be less predictable. [source: Craske et al. 2014]
Example language (illustrative): "This week let's mix it up: one big step on Monday, a small one Wednesday, and the café on Saturday instead of the usual one."
Watch for: Clients who feel tricked by unpredictability: always get agreement in principle first. Evidence for multiple contexts is mixed. [source: Craske et al. 2014]

4.19 Deepened extinction (combining cues)

Purpose / when: After two or more cues have each been practised separately. [source: Craske et al. 2014]
Steps: (1) Run exposure to cue A and cue B separately until each has been practised. (2) Combine them in one exposure (for example two spiders together; an obsessional thought with a knife present; several interoceptive sensations together; caffeine during an in vivo panic exposure). (3) Record predictions and SUDS as usual. [source: Craske et al. 2014]
Example language (illustrative): "You've done the dizziness and the fast heartbeat on their own. Today we put them together: spin, then run on the spot straight away."
Watch for: Combinations that jump too far up the ladder; offer as a planned top-of-ladder item. [synthesis]

4.20 Occasional reinforced extinction (planned mishaps)

Purpose / when: Selected cases, mainly social fears, to prepare for real negative outcomes and reduce rapid return of fear; the authors say it is ethically prohibitive in trauma exposure. [source: Craske et al. 2014]
Steps: (1) With explicit consent, include items where a mild version of the feared outcome actually happens (for example, deliberately doing something mildly embarrassing in public, a mild rejection). (2) Review how bad it actually was and how the client coped. [source: Craske et al. 2014; the article mentions "shame attacks" and deliberate social rejection]
Example language (illustrative): "Today the test isn't whether people notice you; it's whether you can cope when they do."
Watch for: Only use with harmless outcomes, after rapport and earlier successes; never with trauma memories. [synthesis + source]

4.21 Affect labelling

Purpose / when: During exposures, especially when clients try to suppress or reason away fear. [source: Craske et al. 2014]
Steps: (1) Before and during the exposure, ask the client to name what they feel and what they see, in words, without trying to change it. (2) Do not follow with reappraisal during the exposure. [source: Craske et al. 2014]
Example language (illustrative): "Just describe it: 'I'm scared, my chest is tight, the dog is looking at me.' No need to argue with it."
Watch for: Labelling sliding into self-reassurance. [synthesis]

4.22 Post-exposure consolidation review

Purpose / when: Immediately after every exposure. [source: Craske et al. 2014; Anxiety Canada]
Steps: (1) Re-rate the likelihood of the feared outcome. (2) Ask: did the feared outcome occur, how did what happened differ from the prediction, what did you learn? (3) Write the lesson on the record form. (4) Cognitive discussion and reassurance can be used here, not before or during. [source: Craske et al. 2014; Anxiety Canada]
Example language (illustrative): "You predicted 80% that you'd collapse. You stood there twelve minutes. What does that tell you?"
Watch for: Discounting ("I was lucky", "only because you were here"), which points to a hidden safety signal for the next item.

D. Between-session work and maintenance

4.23 Self-directed exposure homework and records

Purpose / when: From the first successful in-session item; most practice happens between sessions. [source: Anxiety Canada; Schmidt & Trakowski 2004; CEBC Coping Cat]
Steps: (1) Choose one or more items done in session or the next item up. (2) Fix day, time, place, length and number of repetitions. (3) Client records date, item, pre/peak/post SUDS, prediction, outcome and what was learned. (4) Aim for frequent practice (daily where the item allows). (5) Review records first thing next session. [source: Anxiety Canada; Schmidt & Trakowski 2004 for daily practice; review step synthesis]
Example language (illustrative): "Let's write it as an appointment: Tuesday and Thursday at 8, the supermarket, 20 minutes, no phone."
Watch for: Vague assignments; homework not reviewed (signals it doesn't matter). See 5.4.

4.24 Response prevention alongside the ladder (OCD and compulsive safety behaviours)

Purpose / when: When the feared cue triggers rituals or compulsions; in ERP the client refrains from escape responses and rituals at all times, not only in sessions. [source: Wikipedia, citing Abramowitz et al. 2011 and Hezel & Simpson 2019]
Steps: (1) For each ladder item, specify the ritual to be withheld. (2) Agree response-prevention rules for the day of practice or across the board. (3) Record urges and ritual slips. [source: as above; detail synthesis; for full ERP procedure see the ERP guide]
Example language (illustrative): "After touching the bin, the plan is no handwashing until lunch. Rate the urge every 10 minutes."
Watch for: Mental rituals and reassurance-seeking replacing overt washing or checking.

4.25 Rewards and reinforcement (children, families, self-help)

Purpose / when: To sustain effort, especially with children. [source: Anxiety Canada; CEBC Coping Cat; Ollendick et al. 2010]
Steps: (1) Agree rewards for completed steps in advance (small treats or outings; praise). (2) Teach self-praise and self-evaluation of effort (in Coping Cat, the "Results and Rewards" step of the FEAR plan and weekly "Show That I Can" tasks). (3) Reward the attempt and the effort, not the absence of fear. [source: Anxiety Canada; CEBC Coping Cat; step 3 synthesis]
Example language (illustrative): "You patted the dog for a whole minute. That's a sticker and you choose Friday's film."
Watch for: Rewards given for avoidance or partial steps; parental accommodation (doing things for the child) undermining the ladder. [synthesis]

4.26 Re-rating the ladder and progress review

Purpose / when: Every few sessions and at the end. [source: Anxiety Canada]
Steps: (1) Re-rate all items without looking at old ratings. (2) Compare with the original. (3) Remove mastered items, add new ones that have emerged, and check that the top still reflects the goal. (4) Repeat the BAT at end of treatment. [source: Anxiety Canada; Athabasca/Wolpe; BAT step from 4.2]
Example language (illustrative): "Let's rate the whole list again from scratch and see what's moved."
Watch for: Top items that have not moved because they were never practised.

4.27 Maintenance exposures, retrieval cues and relapse prevention

Purpose / when: Final sessions. [source: Anxiety Canada; Craske et al. 2014]
Steps: (1) Explain that fear can return during stress or life changes and that this is common. (2) Build planned ongoing exposures into routine life (Anxiety Canada's example: regular blood tests or blood donation after needle phobia). (3) If fear returns, go back to the ladder and plan more exposures. (4) Optionally teach a retrieval cue (for example mentally recalling a successful exposure) for use when fear returns; use sparingly because cues can become safety signals. [source: Anxiety Canada; Craske et al. 2014]
Example language (illustrative): "If the fear creeps back after a stressful month, that's the signal to climb a few rungs again, not a sign treatment failed."
Watch for: Reliance on the cue as a safety signal; total avoidance creeping back.

5. Handling problems

Source-based guidance is tagged; everything tagged [synthesis] is my own clinical synthesis, not drawn from the primary sources.

5.1 A step will not move (fear stays high, no progress after repeats).

Add intermediate items between the stuck item and the one below; hold the lower item longer; shorten the exposure time (systematic desensitisation guidance). [source: Athabasca/Wolpe]
Check whether the exposure was too frightening too soon or not repeated enough; go back to smaller steps with more repetition. [source: Anxiety Canada]
Look for hidden safety behaviours and remove them; check the prediction is concrete and actually tested. [source: Craske et al. 2014]
Under the inhibitory version, high fear at the end of an exposure is not by itself failure; judge progress by changed predictions and approach behaviour across sessions. [source: Craske et al. 2014]
For interoceptive clients who sensitise, start with easier exercises and run them longer. [source: Schmidt & Trakowski 2004]

5.2 Refusal or reluctance to start ("resistance").

Begin with a low, acceptable item; the inhibitory-learning authors recommend this specifically to prevent refusal. [source: Craske et al. 2014]
Revisit the avoidance cycle using the client's costs of avoidance and valued goal at the top of the ladder. [source: Div 12 rationale; Anxiety Canada goal-setting]
Offer participant modelling: do it first yourself. [source: Div 12; Ollendick et al. 2010]
Offer imaginal or VR versions as a bridge where in vivo is refused. [source: Div 12; synthesis on sequencing]
Phase out safety behaviours gradually rather than all at once if refusal is otherwise likely. [source: Craske et al. 2014]
Ask what the client fears about the exposure itself (losing control, being pushed); renegotiate control explicitly. [synthesis]

5.3 Overwhelm, panic or wanting to escape mid-exposure.

Anxiety is expected; coach the client to stay, label the feeling and continue rating. [source: Anxiety Canada; Craske et al. 2014 affect labelling]
In systematic desensitisation, if anxiety is extreme, stop the scene and return to relaxation, then resume at a lower item. [source: Athabasca/Wolpe]
[synthesis] In in vivo work, if the client must leave, help them re-enter as soon as possible (even a smaller version) rather than ending on escape; then add an intermediate step. Avoid ending sessions at the client's peak because of therapist discomfort.
[synthesis] If dissociation appears (glazed, detached, losing time), ground the client in present-moment sensory contact, lower intensity, and treat dissociation as a sign the step is too high or the frame is wrong (for trauma, use a trauma-specific protocol).
BII: if the client feels faint, use applied tension and keep them seated or lying. [source: leaflet; positioning synthesis]

5.4 Non-adherence to homework.

Make assignments specific (time, place, length, repetitions) and plan in advance. [source: Anxiety Canada "plan ahead"]
[synthesis] Review records first each session; problem-solve obstacles; do the first instance of a homework item together in session; reduce the step if it was too big; involve a family member to prompt (not to act as a safety signal).
For interoceptive practice, if effort was partial, repeat, extend or substitute the exercise. [source: Schmidt & Trakowski 2004]
For children, link completion to agreed rewards. [source: Anxiety Canada; CEBC Coping Cat]

5.5 Hidden safety behaviours and reassurance-seeking.

Ask after every exposure what helped the client get through; check for distraction, checking, carrying items. Remove at once if agreed, gradually if needed to prevent dropout. [source: Craske et al. 2014]
Do not reassure before or during the exposure; save discussion for after. [source: Craske et al. 2014]
Build solo exposures so the therapist is not the safety signal. [source: Craske et al. 2014]

5.6 Over-cautious pacing (therapist-driven). Known risk: therapists with negative beliefs about exposure build less ambitious ladders, choose easier tasks and try to minimise client anxiety. [source: Farrell et al. 2013] [synthesis] Responses: check the ladder reaches the client's real goal; set a target for how quickly you will reach the middle of the ladder; get supervision or peer consultation on whether pacing is the client's need or yours; remember that the client controls agreement, but the therapist owns proposing challenging steps.

5.7 Ruptures (client feels pushed, tricked or unheard).

[synthesis] Name it directly, take responsibility for any surprise, and return control: re-agree the stop signal, the step size and how much unpredictability the client has signed up for (variability must be agreed in advance [source: Craske et al. 2014]).
[synthesis] Validate the fear while keeping the rationale: the aim is to step back to a smaller rung, not abandon the ladder.
[synthesis] Use the rupture as data: what did the client predict would happen in the relationship, and was it disconfirmed?

5.8 Fear returns after improvement. Return of fear during stress or life change is common; plan more exposures, go back to the ladder. [source: Anxiety Canada] Ongoing planned exposures and varied contexts help prevent it; retrieval cues can be used sparingly. [source: Craske et al. 2014]

5.9 Modality-specific difficulties.

Items cannot be arranged in real life (flying, storms, rare events): use imaginal or VR items, video, or nearest real-world analogues; check transfer when real exposure becomes possible. [source: Div 12; Athabasca/Wolpe; analogues are synthesis]
No middle-range items: vary duration, time, setting, company to create them. [source: Anxiety Canada]
Client cannot imagine vividly (imaginal or systematic desensitisation): practise with a neutral control scene; add sensory detail; switch to in vivo. [source: Athabasca/Wolpe for control scene; rest synthesis]
Client cannot relax (systematic desensitisation): use an alternative competing response (Wolpe accepted humour, assertive behaviour and others) or move to plain in vivo exposure. [source: Athabasca/Wolpe; Div 12]
Fear is of internal sensations: build an interoceptive ladder rather than (or alongside) a situational one. [source: Schmidt & Trakowski 2004]
Fainting in BII: teach applied tension before exposure; do not use relaxation, which may lower blood pressure further. [source: Div 12 for applied tension; the warning against relaxation is synthesis [uncertain]]
Children: use a 0–10 or thermometer scale, more concrete steps, modelling and rewards; inform and involve parents; watch for parental accommodation and parents' own anxiety slowing the pace. [source: Anxiety Canada; Ollendick et al. 2010; CEBC Coping Cat; accommodation point synthesis]
Obsessions and compulsions: ladder plus response prevention; watch for mental rituals. [source: Wikipedia/ERP refs; see ERP guide]
Trauma: do not use occasional reinforced extinction with trauma material [source: Craske et al. 2014]; use PE or another trauma protocol rather than a generic ladder. [synthesis]
Comorbid depression or low energy: smaller, more frequent steps and behavioural activation framing. [synthesis]
Suicidality or self-harm emerging: pause exposure, complete a standard structured risk assessment and safety plan, including lethal-means counselling (secure storage or removal), and resume only when stable. [synthesis following current standard practice]

Sources

Sources:

Further reading (not drawn on unless listed above): books and papers cited

Wolpe, J. (1958). Psychotherapy by Reciprocal Inhibition.
Wolpe, J. (1990). The Practice of Behavior Therapy (4th ed.).
Jacobson, E. (1938). Progressive Relaxation.
Marks, I. M. (1978). Living with Fear.
Bandura, A., Blanchard, E. B., & Ritter, B. (1969). Relative efficacy of desensitization and modeling approaches. Journal of Personality and Social Psychology.
Williams, S. L. (1990). Guided mastery treatment of agoraphobia.
Öst, L.-G., & Sterner, U. (1987). Applied tension. Behaviour Research and Therapy.
Öst, L.-G. (1989). One-session treatment for specific phobias. Behaviour Research and Therapy, 27, 109–121.
Öst, L.-G., & Ollendick, T. H. (2001). OST manual for children (cited by Ollendick et al. 2010).
Craske, M. G., Antony, M. M., & Barlow, D. H. (1997/2006). Mastery of Your Specific Phobia: Therapist Guide.
Abramowitz, J. S., Deacon, B. J., & Whiteside, S. P. H. (2011; 2nd ed. 2019). Exposure Therapy for Anxiety: Principles and Practice.
Kendall, P. C., & Hedtke, K. (2006). Cognitive-Behavioral Therapy for Anxious Children: Therapist Manual (3rd ed.).
Zlomke, K., & Davis, T. E. (2008). One-session treatment of specific phobias: a detailed description and review. Behavior Therapy, 39, 207–223.

[uncertain] Not drawn on: Wolpe's own books, Öst's OST manual, Abramowitz et al. and Craske et al. therapist guides; detail attributed to them comes via the secondary summaries listed above.

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