Positive psychology interventions

1. Introduction

Version followed: the exercise set tested by Seligman, Steen, Park & Peterson (2005) and packaged by Seligman, Rashid & Parks (2006), delivered according to Lyubomirsky and Layous's positive-activity model (Layous & Lyubomirsky 2012/2014; Sin & Lyubomirsky 2009). The definition of a PPI is the one used by Sin & Lyubomirsky (2009) and Bolier et al. (2013). Other named exercises (best possible self, kindness, active-constructive responding, savoring, loving-kindness meditation) follow the papers that introduced or tested them, as cited in each entry.

What it is. Positive psychology interventions (PPIs) are a family of brief, structured exercises, not one therapy with one manual. A PPI is a training, exercise or therapy whose main aim is to build positive feelings, positive thoughts or positive behaviours, rather than to fix a deficit, and which rests explicitly on positive-psychology theory [source: Bolier et al. 2013, citing Sin & Lyubomirsky 2009]. Typical examples are gratitude letters, counting blessings, acts of kindness, using one's strengths, imagining a best possible self, and writing about or savouring positive experiences. Most were designed to be self-administered in about a week, online and with no therapist involved. They can also be run in groups or built into individual therapy, and individual delivery showed the largest effects in meta-analysis [source: Seligman et al. 2005; Sin & Lyubomirsky 2009].

How change is thought to happen. Seligman's group treats well-being as three routes: the pleasant life (positive emotion), the engaged life (absorption, using one's strengths) and the meaningful life (serving something larger). In the positive psychotherapy (PPT) version, low levels of all three are argued to help cause and maintain depression, not just accompany it [source: Seligman et al. 2005; Seligman, Rashid & Parks 2006]. The positive-activity model proposes that simple activities raise well-being by increasing four things: positive emotions, positive thoughts, positive behaviours, and satisfaction of the needs for autonomy, relatedness and competence. These gains can then build lasting resources in an upward spiral, drawing on Fredrickson's broaden-and-build theory. How large the gains are depends on features of the activity (dose, timing, variety, social support), features of the person (motivation, effort, beliefs, baseline mood, culture, age), and the fit between the two [source: Layous & Lyubomirsky 2012]. Gains last mainly when people keep practising [source: Seligman et al. 2005; Sheldon & Lyubomirsky 2006].

2. Framework

PPIs have no fixed phase model; this is stated plainly in the sources, which describe single exercises, programmes and one therapy package. The delivery formats the sources actually describe are:

Format	Structure	Source
Single self-guided exercise	One exercise practised for one week (often nightly), with two reminder emails; follow-up at 1 wk, 1, 3 and 6 months	Seligman et al. 2005
Lab-launched exercise	One in-person writing session, then a suggestion to repeat it at least twice over the next two weeks, with a 4-week check	Sheldon & Lyubomirsky 2006
Group PPI programme	6 weekly 2-hour group sessions (8–11 clients), one exercise per week in a fixed order; each session = review of last week's homework + teaching the new exercise with explicit instructions; final session on maintenance and tailoring	Seligman, Rashid & Parks 2006
Individual positive psychotherapy	Up to 14 sessions within 12 weeks; one theme and homework per session; a mid-therapy review at session 7	Seligman, Rashid & Parks 2006
Loving-kindness workshop	6 weekly 60-minute group sessions; home practice at least 5 days a week with guided recordings	Fredrickson et al. 2008

Recommended dose. Run PPIs for at least 4 weeks, and preferably 8 or more, delivered individually where possible. They can be used alongside problem-focused treatment (for example after remission, to build resilience) or as a low-intensity first step in stepped care [source: Bolier et al. 2013]. Longer interventions give larger gains, possibly because habits have time to form [source: Sin & Lyubomirsky 2009].

A working sequence for adjunctive use in therapy [synthesis, assembled from the sources above]:

Assess and orient (session 1). Screen for mania or hypomania (PPIs are not for clinically manic clients) and for severe depression (exercises may be too demanding; use them as an adjunct only) [source: Layous & Lyubomirsky 2012]. Explain the pleasant, engaged and meaningful routes. Agree that problems will still be addressed.
Identify strengths and preferences (sessions 1–2). A positive introduction or 'you at your best' story, the VIA strengths survey, and a conversation about which kinds of activity appeal (social or solitary, reflective or behavioural).
Select and assign (each session). Choose one or two activities that fit the client. Give specific, concrete instructions and agree when and how often the client will practise.
Practice and review (weekly). Open each session by reviewing the homework: what was done, what it felt like, and any obstacles. Then teach the next exercise. This is the structure of the group PPI programme.
Rotate for variety (from about week 3). Change or add activities, or vary how an existing one is done, to counter hedonic adaptation [source: Layous & Lyubomirsky 2012].
Maintain (final sessions). The client picks the exercises they will keep and builds them into a routine. Continued practice predicts lasting benefit [source: Seligman et al. 2005; Seligman, Rashid & Parks 2006].

Criteria for moving on [synthesis; no source gives formal criteria]:

Move to a new activity once the client has done the current one several times and can describe its effect.
Also move on if the client reports boredom, or if the activity has become rote.
Keep an activity the client rates as enjoyable and personally meaningful ('self-concordant'); that sense of ownership predicted continued practice [source: Sheldon & Lyubomirsky 2006].
Switch an activity that, after a fair trial, feels forced or lowers mood.
Move to maintenance when practice is self-initiated rather than prompted.

3. Guiding principles

Build what is good, not only fix what is wrong. Spend session time on deliberately building positive emotion, engagement, meaning and relationships [source: Seligman, Rashid & Parks 2006].
Do not ignore suffering. Attend empathically to negative emotions and problems, and treat them as important. The aim is balance, not replacing problem talk with exercises. A deficit-only focus risks damaging the alliance [source: Seligman, Rashid & Parks 2006].
Be a witness to strengths. Your role is to see and name the client's strengths, not to act as an authority correcting faulty thinking. Open with the client's positive story [source: Seligman, Rashid & Parks 2006].
Negative emotions are normal and useful. The goal is not to eliminate them; never imply that the client is failing because they still feel bad [source: Layous & Lyubomirsky 2012].
Point attention at the activity, not at being happy. Valuing happiness intensely can backfire through disappointment, so frame exercises around concrete acts, often for other people, rather than around a mood target [source: Layous & Lyubomirsky 2012, citing Mauss et al. 2011].
Match the activity to the person. Choose activities that fit the client's interests, values and personality: social activities for sociable clients, spiritual ones for religious clients (the authors offer this as a hypothesis). Preference alone is not enough, so treat fit as one input among several [source: Layous & Lyubomirsky 2012].
Protect autonomy. Offer choices and use autonomy-supportive language; an imposed or nagging exercise loses benefit. Support the client should perceive works better than support that feels intrusive [source: Layous & Lyubomirsky 2012].
Be specific. Give concrete instructions covering what, when, how often and in what form, because vague advice works less well [source: Layous & Lyubomirsky 2012].
Effort and continued practice are the active ingredients. Gains track effort, and they persist mainly in people who keep going after the assigned period; recruit and reinforce effort [source: Seligman et al. 2005; Layous & Lyubomirsky 2012].
More is not always better. Calibrate dose and timing: counting blessings once a week beat three times a week, and five kind acts in one day beat five spread over a week [source: Layous & Lyubomirsky 2012, citing Lyubomirsky et al. 2005].
Vary activities to beat adaptation. People adapt to positive experiences, so change what they do, or how they do it, over time [source: Layous & Lyubomirsky 2012].
Mind culture. Self-focused activities may suit individualist clients and other-focused ones (gratitude letters, kindness) may suit collectivist clients. Self-congratulation and loud expression of joy are not welcome everywhere [source: Sin & Lyubomirsky 2009; Kennelly 2012].
Build motivation actively. Self-selected, motivated clients gain more, so explore readiness and reasons before assigning [source: Sin & Lyubomirsky 2009].
Adjunct for severe presentations. For severe depression and other serious disorders, use PPIs alongside evidence-based treatment, not instead of it. Do not use them with clients who are clinically manic [source: Layous & Lyubomirsky 2012; Bolier et al. 2013].
Use your relationship skills. Warmth, empathy and genuineness are expected to matter, and the authors expect PPIs combined with CBT, IPT or medication to do better than PPIs alone [source: Seligman, Rashid & Parks 2006].

4. Intervention inventory

All example wording below is illustrative and was written for this guide; none of it is quoted from the source authors. Interventions 1–7 come from the core Seligman/Lyubomirsky literature. Interventions 15–21 appear only inside the 14-session positive psychotherapy package. A note at the end lists other intervention types that the meta-analyses count as PPIs but whose procedures are not drawn on in this guide.

1. Three good things (Blessings Journal)

Purpose / when to use: Shifts attention and memory away from the negativity bias in depression by noticing and explaining what went well. Seligman et al. (2005) found it effective at 1, 3 and 6 months, and it was the second group PPI session and an ongoing journal in individual PPT. It is a good first exercise: easy, cheap, and it tends to sustain itself [source: Seligman et al. 2005; Seligman, Rashid & Parks 2006].
Steps:
1. Agree on a fixed time each evening, such as before bed, and a medium (notebook or phone note).
2. Each night the client writes three things that went well that day; large or small both count.
3. Beside each, the client writes why it happened: their own part, other people's part, or circumstances.
4. Do this every night for one week at first. Review the entries in session, then offer to make it an ongoing journal.
5. In review, look for patterns: recurring people, the client's own contribution, the strengths shown.
Example language (illustrative): "Tonight, write down three things that went well today, even small ones. Then for each one, add a line about why you think it happened."
Watch for: entries that are only external luck, with no role for the client; prompt for their own contribution. Watch for 'good things' written with a sting of self-criticism ('at least I didn't completely fail'). Repetition can become rote; vary it (for example, one entry about another person each night). It is working when the client finds items more easily, spontaneously notices good things during the day, and keeps doing it unprompted.

2. Counting blessings (gratitude list)

Purpose / when to use: Builds gratitude and a more favourable reading of one's own life by listing what one is grateful for. This is the Emmons & McCullough (2003) task, used as a comparison condition in Sheldon & Lyubomirsky (2006). Use it with clients who prefer reflecting over doing [source: Sheldon & Lyubomirsky 2006; Layous & Lyubomirsky 2012].
Steps:
1. The client thinks about, then lists, things large and small they are grateful for. Prompt across domains: supportive relationships, sacrifices others made for them, and advantages and opportunities.
2. Set the frequency deliberately. Once a week outperformed three times a week in Lyubomirsky's study, so start weekly [source: Layous & Lyubomirsky 2012].
3. Ask for specific items rather than generic categories, and vary the domains week to week.
Example language (illustrative): "Once this week, sit down for ten minutes and list what you're grateful for. Think of people, things others have done for you, and opportunities you've had."
Watch for: it can feel harder and less enjoyable than imagining a hoped-for future, and clients may identify with it less [source: Sheldon & Lyubomirsky 2006]. Watch for 'should be grateful' guilt, or gratitude used to dismiss legitimate grievances [synthesis]. It is working when items become more specific and the client reports warmth or appreciation, not obligation.

3. Gratitude letter and gratitude visit

Purpose / when to use: Expresses deep thanks to a specific person. In Seligman et al. (2005) the visit produced the largest short-term boost of any exercise, with gains still present at one month and gone by three months. It is session 6 of individual PPT and session 4 of the group programme. It suits clients with a living benefactor they can reach. The letter alone, without delivery, also helped [source: Seligman et al. 2005; Seligman, Rashid & Parks 2006; Layous & Lyubomirsky 2012].
Steps:
1. The client identifies someone who was especially kind or important to them and whom they never properly thanked.
2. They write a letter: what the person did, specifically, and how it affected their life then and now. Lyubomirsky's versions used roughly 8–10 minutes of writing; Seligman's version is a fuller letter.
3. Gratitude visit option: arrange to meet without revealing the purpose in advance, read the letter aloud in person (or by phone in the group version), then discuss it together.
4. Unsent option: keep or re-read the letter. This is useful when contact is impossible or unsafe.
5. Debrief in session: what it was like to write it, and to deliver it.
Example language (illustrative): "Who has made a real difference to you that you've never fully thanked? Let's think about what exactly they did, and what it changed for you."
Watch for: the recipient may be deceased, estranged or unpredictable. Plan for a muted response and pre-agree what that would mean, so the client does not read it as rejection of themselves [synthesis]. Mildly depressed participants once did better with a neutral music task than with letter writing, possibly because the letter was too demanding. With low-energy clients, start with the unsent letter or a shorter version [source: Layous & Lyubomirsky 2012]. The boost fades within months, so pair the letter with an ongoing practice.

4. You at your best / positive introduction

Purpose / when to use: The client tells a concrete story of themselves at their best, then identifies the strengths it shows. On its own it gave only a short-lived boost, but the authors suggest it works as an entry point to strengths work. In PPT it is the session 1 homework: a roughly one-page 'positive introduction' [source: Seligman et al. 2005; Seligman, Rashid & Parks 2006].
Steps:
1. The client writes (or tells) a specific story with a beginning, middle and end about a time they were at their best.
2. Together, read it and name the character strengths it shows.
3. In the 2005 version, the client re-reads the story daily for a week and reflects on the strengths in it.
4. Use the identified strengths as a bridge into the VIA survey (intervention 5).
Example language (illustrative): "Tell me about a time, maybe recent, maybe long ago, when you were at your best. Walk me through what happened. ... What does that story say about you?"
Watch for: depressed clients who 'can't think of one'. Lower the bar to a moment rather than a triumph, or ask what someone who knows them would pick [synthesis]. Do not treat it as a stand-alone treatment.

5. Identifying signature strengths (VIA survey)

Purpose / when to use: The client learns their top five 'signature' strengths. In 2005 this exercise alone gave only an immediate effect; it is the foundation for intervention 6 and for PPT sessions 2–3 [source: Seligman et al. 2005; Seligman, Rashid & Parks 2006].
Steps:
1. The client completes the online VIA Inventory of Strengths (VIA-IS). Use the official free version; do not reproduce the items.
2. Note the top five strengths, and ask which feel truly 'me'.
3. Link the results to the client's positive-introduction story and to times these strengths helped them.
4. In the short 2005 version, the client simply uses these strengths more often for a week.
Example language (illustrative): "Of your top five, which ones feel most like the real you? When did one of them help you get through something?"
Watch for: clients who dismiss results that 'aren't really me'. Treat these as hypotheses to test, not verdicts [synthesis]. It is working when the client can name strengths fluently and spot them in daily events.

6. Using signature strengths in a new way

Purpose / when to use: Increases engagement through deliberate, novel use of the client's top strengths. It had a modest immediate effect but lasting gains at 1–6 months, and the authors consider it self-maintaining. It is PPT session 3 and group session 1 [source: Seligman et al. 2005; Seligman, Rashid & Parks 2006].
Steps:
1. Choose one signature strength per day.
2. Plan a new way to use it today, one the client has not used before. In PPT the plan is a specific, concrete, achievable behaviour.
3. Carry it out, then note briefly what was done and how it felt.
4. Continue for one week, then review and choose which uses to keep.
Example language (illustrative): "Curiosity is one of your top strengths. What's one new way you could use it tomorrow, at work or at home? Let's make it concrete: when, where, doing what."
Watch for: plans that are too big; shrink them to something that takes 10–15 minutes. Watch for strengths over-used to the client's own cost, such as kindness that slides into self-neglect [synthesis]. It is working when the client reports absorption ('time flew') and invents new uses unprompted.

7. Best possible self (BPS)

Purpose / when to use: An optimism exercise in which the client imagines and writes about a future in which things have gone as well as possible. Clients identified with it more than with counting blessings, and continued practice predicted sustained positive mood. It is useful for low hope, aimlessness, or as a way to surface goals [source: Sheldon & Lyubomirsky 2006, adapting King 2001].
Steps:
1. The client imagines their life at a chosen future point, assuming everything has gone as well as it could. They have worked hard and reached their life goals.
2. They write about this ideal future in as much detail as possible. The source studied does not specify a time limit or life domains; many later versions do, so treat any domain prompts or timings as your own adaptation [uncertain].
3. Ask the client to repeat the visualising or writing on at least two more occasions over the next two weeks, and over the following weeks after that.
4. In session, extract what the imagined future says about what the client values, and turn it into near-term goals [synthesis].
Example language (illustrative): "Picture yourself some years from now. Things have gone as well as they possibly could, because you worked for them. Describe a day in that life in as much detail as you can."
Watch for: a painful gap between the imagined future and the client's present, comparison with others, or fantasies that are out of reach [synthesis]. Foreign-born Asian American participants showed a non-significant trend towards doing better with gratitude letters than with BPS, so consider other-focused alternatives [source: Layous & Lyubomirsky 2012]. It is working when the client feels energised and motivated rather than deflated, and keeps returning to it.

8. Acts of kindness

Purpose / when to use: Builds positive behaviour, relatedness and positive regard from others by doing deliberate kind acts. It may suit collectivist-oriented or socially motivated clients especially well [source: Layous & Lyubomirsky 2012; Sin & Lyubomirsky 2009].
Steps:
1. Pick one 'kindness day' per week. In Lyubomirsky's work, doing five kind acts in a single day gave larger gains than spreading five acts across the week.
2. The client plans and carries out five acts that day, large or small, for others; the beneficiaries need not know.
3. Vary the acts from week to week. Changing which acts were done each week beat repeating the same ones (Sheldon et al. 2012).
4. Optionally keep a log of the acts and how each felt.
5. Frame it as the client's own choice, since autonomy-supportive framing improved outcomes [source: Layous & Lyubomirsky 2012].
Example language (illustrative): "Choose one day this week to be your kindness day, and aim for five acts that day. Mix them up: one for a stranger, one for someone close, whatever suits you."
Watch for: people-pleasing, self-sacrifice or exploitation, especially in clients who already over-give. Here, make one of the five acts kind to themselves, or work on boundaries first [synthesis]. In one study, U.S. and South Korean students gained only when they felt supported by peers, so social context matters [source: Layous & Lyubomirsky 2012]. It is working when the client reports warmth, connection and a sense of agency.

9. Active-constructive responding (ACR)

Purpose / when to use: Improves close relationships by responding well when other people share good news. Capitalisation is the benefit people gain from telling someone else about a positive event. Gable et al. (2004) described four response styles; only the active-constructive style (enthusiastic, asking questions) was associated with higher intimacy, satisfaction and trust. That evidence is correlational. ACR is group PPI session 5 and part of PPT session 10 [source: Gable et al. 2004; Seligman, Rashid & Parks 2006].
Steps:
1. Teach the four styles with the client's own examples:
  - active-constructive: enthusiastic and curious;
  - passive-constructive: quietly pleased, low-key;
  - active-destructive: points out the downside;
  - passive-destructive: uninterested, or changes the subject.
2. Ask the client which style they habitually use, and with whom.
3. Role-play: you share some small good news and the client practises an active-constructive reply. Swap roles.
4. Homework: at least once a day, respond actively and constructively to someone's good news, then note what happened.
5. Optionally add the reverse: the client shares their own good news with someone likely to respond well. Sharing positive events was linked to more positive affect and better recall of those events [source: Gable et al. 2004].
Example language (illustrative): Coaching the client: "When your partner tells you something good, try asking two questions about it before you say anything else: how it happened, and what it means to them." Example ACR reply (illustrative): "That's brilliant! How did you find out? What was going through your head when they told you?"
Watch for: enthusiasm that feels fake. Coach genuine curiosity rather than volume [synthesis]. Note that passive-constructive responses were also linked to poorer relationship quality, so 'quietly supportive' is not enough [source: Gable et al. 2004]. In hostile or abusive relationships, do not frame ACR as the client's job to fix the relationship [synthesis].

10. Savouring exercise (daily)

Purpose / when to use: Noticing pleasure and deliberately making it last; it counters the 'hedonic treadmill' of rushing past good moments. This is group PPI session 6 and PPT session 12 [source: Seligman, Rashid & Parks 2006].
Steps:
1. Once a day, the client picks something they normally rush through, such as a meal, a shower or a walk.
2. They do it slowly and with full attention.
3. Afterwards they write what they did, how they did it differently, and how it felt compared with rushing.
4. PPT version: plan specific pleasurable activities in advance and apply named savouring techniques during them (see intervention 11).
Example language (illustrative): "Pick one ordinary thing tomorrow, maybe your morning coffee, and do it as if you had all the time in the world. Afterwards, jot down what you noticed that you usually miss."
Watch for: multitasking, which undermines absorption, and 'killjoy' thoughts such as 'this won't last' or 'I don't deserve this' [source: Kennelly 2012, summarising Bryant]. It is working when the client reports sharper sensory detail and a positive feeling that lingers.

11. Savouring strategies (Bryant)

Purpose / when to use: A menu of specific ways to prolong or deepen positive experiences, for use within intervention 10 or on their own. This list comes from Bryant's research as summarised by Greater Good; the primary book (Bryant & Veroff 2007) is not drawn on here, so the exact wording and number of strategies in the book are [uncertain] [source: Kennelly 2012].
Steps (strategies to teach; choose 2–3 that fit the client):
1. Share it: tell someone about the good moment.
2. Mental photograph: deliberately store the moment to remember later.
3. Self-congratulation: acknowledge one's own effort. This is culture-dependent.
4. Sharpen the senses: focus on one sense at a time.
5. Express it outwardly: laugh or cheer. Also culture-dependent.
6. Downward comparison: remind oneself how it could have been worse.
7. Absorption: quiet one's thoughts and immerse in the moment.
8. Count blessings and give thanks: in the moment, or by recalling a blessing each night.
9. Avoid killjoy thinking: notice and set aside negative thoughts, especially after a success.
10. Remember that time flies: mark the moment's transience. Savouring can also be applied to past good times and anticipated future ones.
Example language (illustrative): "Next time something good happens, try one of these: take a mental photograph, or call someone and tell them about it. Then notice how long the good feeling stays."
Watch for: 'time flies' turning into poignant sadness, or downward comparison turning into guilt [synthesis]. Respect cultural norms around self-praise.

12. Loving-kindness meditation (LKM)

Purpose / when to use: Systematically generates warmth and goodwill. Practice increased daily positive emotions over weeks, which in turn built resources such as mindfulness, purpose, social support and fewer illness symptoms, and so raised life satisfaction. Note that Bolier et al. (2013) excluded meditation from their PPI definition; it is included here because Fredrickson's trial is a core positive-emotion study [source: Fredrickson et al. 2008; Bolier et al. 2013].
Steps (as delivered in Fredrickson et al. 2008):
1. Six weekly 60-minute group sessions. Each has about 15–20 minutes of guided meditation, about 20 minutes of check-in and questions, and about 20 minutes of teaching on applying LKM in daily life.
2. Widen the target of warm feelings each week: week 1 oneself; week 2 add loved ones; later acquaintances, then strangers, then all living beings.
3. Home practice at least 5 days a week with guided recordings (15–22 minutes) of increasing scope.
4. Individual adaptation [synthesis]: teach the same progression over several sessions and give a recording for home practice.
Example language (illustrative): "Bring to mind someone who easily makes you feel warm, and silently offer them good wishes. Notice whatever feeling comes, even if it's faint."
Watch for: effects were slow, emerging around week 3, and depended on enough practice. Encourage persistence through the first weeks. Positive emotions and practice both declined after the workshop ended, so plan for maintenance [source: Fredrickson et al. 2008]. Self-directed kindness can be hard or distressing for self-critical or traumatised clients. If so, start with a benefactor rather than the self, and keep it brief [synthesis].

13. Obituary / legacy biography

Purpose / when to use: Clarifies meaning and values by imagining how one would want to be remembered. This is group PPI session 3; the source labels it both 'obituary' and 'biography' [source: Seligman, Rashid & Parks 2006].
Steps:
1. The client imagines having lived a full, satisfying life and having died.
2. They write a one- to two-page essay on what they would most want to be remembered for.
3. In session, compare the essay with how the client spends time now, and pick one change [synthesis].
Example language (illustrative): "Imagine your life has been long and satisfying. What would you most want the people who knew you to say about you?"
Watch for: imagining one's own death can be distressing for clients with suicidal ideation, recent bereavement or health anxiety. Assess suicide risk first and use the biography framing, or postpone the exercise [synthesis]. It is working when the client identifies values and translates them into actions.

14. Activity menu and rotation

Purpose / when to use: A delivery technique rather than a single exercise. Using several activities and rotating them sustains gains against adaptation and improves fit: app users who practised several activities gained more, and varying kind acts sustained benefit [source: Layous & Lyubomirsky 2012; Sin & Lyubomirsky 2009].
Steps:
1. After the client has tried two to four activities, ask them to rate each for enjoyment, how natural it felt, and its effect on mood [synthesis].
2. Keep the top one or two as a core practice.
3. Every few weeks change the content, timing or setting of an activity, or swap in a new one.
4. Encourage a simple record so the client can see their own practice and its effects.
Example language (illustrative): "Of the things you've tried, which ones would you actually miss if you stopped? Let's keep those, and change the rest so they stay fresh."
Watch for: the most preferred activity is not always the most helpful [source: Layous & Lyubomirsky 2012, citing Parks et al. 2012]. Balance preference against observed effect.

Interventions 15–21 are positive psychotherapy (PPT) homeworks. The steps below follow the 2006 'idealised' 14-session plan. The 2018 Rashid & Seligman clinician manual (Oxford University Press) revises the package, but its contents are not drawn on, so differences from it are [uncertain] [source: Seligman, Rashid & Parks 2006].

15. Good versus bad memories (PPT session 4)

Purpose / when to use: Examines how dwelling on bad memories keeps depression going, and prepares the ground for forgiveness work. The session invites the client to express anger and bitterness and discusses what holding on to them costs.
Steps:
1. In session, explore how memories, both good and bad, affect current mood.
2. Homework: write about three bad memories, the anger tied to each, and how each one keeps the depression going.
3. Review next session, and link it to the choice of whether to work on forgiveness.
Example language (illustrative): "Which memories do you keep coming back to? Let's look at what replaying them does to how you feel today."
Watch for: trauma memories. This is a written reflection, not exposure therapy. With PTSD or abuse histories, use a trauma-focused treatment instead, or pace the work carefully with grounding [synthesis].

16. Forgiveness letter (PPT session 5)

Purpose / when to use: Presents forgiveness as a way to move anger and bitterness towards neutral feeling, or for some clients towards positive feeling. Bolier et al. (2013) excluded forgiveness therapy from their PPI definition, so this item belongs to PPT specifically [source: Seligman, Rashid & Parks 2006; Bolier et al. 2013].
Steps:
1. Discuss what forgiveness is and is not. It is not condoning, excusing or reconciling; this distinction is [synthesis], as the 2006 paper only gives the framing above.
2. Homework: write a letter (not to be delivered) describing the wrong and the emotions it caused, and committing to forgive if that feels appropriate.
3. Follow up, often across more than one session. Session 7 is the planned check on this work.
Example language (illustrative): "This letter is for you, not for them; you won't send it. Write what happened and what it did to you. Only if it feels right, write what letting go might look like."
Watch for: pressure to forgive abusers, or forgiveness used to stay in an unsafe relationship. Make forgiveness explicitly optional and prioritise safety [synthesis].

17. Satisficing instead of maximising (PPT session 8)

Purpose / when to use: Reduces the dissatisfaction that comes from always chasing the best option. The session places this in the context of the hedonic treadmill. It suits perfectionistic or indecisive clients.
Steps:
1. Contrast 'good enough' choosing with maximising, using the client's own recent decisions.
2. Homework: list areas where the client could satisfice more, and draft a personal satisficing plan.
Example language (illustrative): "Where in your life are you hunting for the perfect option when 'good enough' would actually serve you better?"
Watch for: satisficing read as lowering standards in areas the client truly cares about. Keep high standards where they serve the client's values [synthesis].

18. One door closes, another opens (PPT session 9)

Purpose / when to use: Builds optimism and hope by finding what followed losses and setbacks.
Steps:
1. In session, recall times the client lost something important, saw a big plan fall through, or was rejected.
2. Homework: identify three doors that closed, and for each the door that later opened.
Example language (illustrative): "Think of a time something you wanted fell through. Looking back, did anything become possible because of it?"
Watch for: recent or traumatic losses where 'silver linings' feel invalidating. Use older, resolved setbacks, and never push meaning onto grief [synthesis].

19. Partner's strengths and strengths date (PPT session 10)

Purpose / when to use: Strengthens love and attachment. The session teaches ACR (intervention 9) and identifies the strengths of a significant other.
Steps:
1. The client identifies the signature strengths of a significant other.
2. Ongoing homework: practise ACR.
3. Plan and go on a date or outing that draws on both partners' strengths.
Example language (illustrative): "What are your partner's top strengths? Could you plan an evening that uses one of theirs and one of yours?"
Watch for: relationships with high conflict or abuse, where this exercise is not appropriate [synthesis].

20. Family tree of strengths (PPT session 11)

Purpose / when to use: Helps the client recognise strengths across the family system.
Steps:
1. Family members, children included, complete the VIA strengths survey. Use the version appropriate for each member's age; the youth version is [uncertain], as it is not specified in the 2006 paper.
2. Draw a family tree showing each person's strengths.
3. Hold a family gathering to discuss them.
Example language (illustrative): "What would it be like to map out the strengths of everyone in your family, including the ones you clash with?"
Watch for: estranged or abusive families. Offer a 'chosen family' version instead [synthesis].

21. Gift of time (PPT session 13)

Purpose / when to use: Builds meaning by using signature strengths in service of something larger than oneself. Giving time is available to anyone, whatever their finances.
Steps:
1. Discuss the ways the client could give time.
2. Homework: give time through an activity that uses the client's signature strengths, such as mentoring a child or community service.
3. Debrief the experience, and link it to the 'meaningful life' route.
Example language (illustrative): "Which of your strengths could you give to someone else this week, as time rather than money?"
Watch for: overcommitment in clients who are already depleted or carrying heavy caring roles. Size the commitment to the energy the client actually has [synthesis].

Other PPI types not detailed here. Bolier et al. (2013) also counted personal goal-setting, writing about positive experiences, life coaching aimed at goals and hope, and well-being therapy for residual symptoms. Sin & Lyubomirsky (2009) mention 'replaying positive experiences', practising optimistic thinking, socialising and doing enjoyable activities. Their specific procedures are not drawn on, so they are [uncertain] and not described step by step here. Well-being therapy (Fava) is a distinct manualised therapy and should be learned from its own manual.

5. Handling problems

The sources say little about handling problems. Each item is tagged with its source; the rest is marked [synthesis].

'This feels like being told to cheer up' (invalidation, alliance strain).
- Slow down and return to the client's distress. PPT explicitly balances positive and negative material, and warns that a lopsided focus damages the alliance [source: Seligman, Rashid & Parks 2006].
- Say plainly that negative feelings are normal and that the exercises add to the work rather than replace it [source: Layous & Lyubomirsky 2012].
- Illustrative: "I don't want this to feel like I'm brushing past what's hard. We'll keep working on that. This is about also building something alongside it."
Scepticism, or low motivation.
- Motivated, self-selected clients gain more, so explore the client's own reasons before assigning anything [source: Sin & Lyubomirsky 2009].
- Offer a choice of two or three activities, and frame each as a one-week experiment with the client as the judge of the results [synthesis; autonomy principle from Layous & Lyubomirsky 2012].
- Do not oversell. Every condition in Seligman et al. (2005), including the placebo, gave a short-lived boost, so be honest that lasting change depends on continued practice.
Overwhelm, or severe depression.
- PPIs may be too demanding for severely depressed clients, and they belong alongside evidence-based treatment, not in place of it [source: Layous & Lyubomirsky 2012].
- Scale exercises down: one good thing instead of three, the letter without the visit, a two-minute savouring moment.
- Treat behavioural activation or another first-line treatment as the backbone of care [synthesis].
- Review suicide risk using standard practice. PPIs are not a risk intervention, and death-related exercises (intervention 13) should be postponed while there is active suicidal ideation [synthesis].
Mania, hypomania or bipolar disorder. Do not use PPIs with clinically manic clients [source: Layous & Lyubomirsky 2012]. In bipolar disorder generally, monitor whether exercises that amplify positive emotion and goal-striving (best possible self, savouring) escalate mood or goal pursuit. This caution is [synthesis/uncertain]; the sources do not address bipolar disorder beyond mania.
Non-adherence.
- Check fit and dose before blaming motivation. Ask whether the activity is too frequent (the once-weekly blessings finding), too vague, or simply disliked [source: Layous & Lyubomirsky 2012].
- Make the plan specific (when, where, which cue). Link it to an existing routine, and keep a log [source: Sin & Lyubomirsky 2009].
- Ask what support the client would like. Perceived support helps, but nagging undermines autonomy [source: Layous & Lyubomirsky 2012].
Boredom, or the exercise 'stopped working'. This is expected, because people adapt. Vary the content and timing, or rotate to a different activity [source: Layous & Lyubomirsky 2012].
Trying too hard to be happy. Some clients monitor their mood after every exercise and feel disappointed. Redirect attention to doing the activity and to the other person (in the letter or the kind act), not to the mood result [source: Layous & Lyubomirsky 2012, citing Mauss et al. 2011].
Feeling a failure after a 'simple' exercise. People who fail at a simple activity may feel discouraged [source: Layous & Lyubomirsky 2012]. Normalise how hard it is, reduce the task, and treat the difficulty as information rather than failure [synthesis].
Gratitude visit goes badly (a lukewarm recipient, or an awkward moment). Before the visit, discuss possible responses and stress that the value is in expressing gratitude, not in the reaction. Afterwards, debrief and validate. Use the unsent option for anyone unsafe or unpredictable [synthesis].
Gratitude, forgiveness or 'silver linings' turned against the client. These can be misused to suppress valid anger, excuse mistreatment or keep someone in an unsafe situation. Screen for abuse and coercion, keep forgiveness optional, and move to safety planning when needed [synthesis].
Trauma or grief responses (to bad-memories writing, one-door-opens, loving-kindness towards oneself). Stop or adapt the exercise, ground the client, and move to trauma-focused or grief work. Self-directed loving-kindness can trigger shame. Begin with a benefactor or a neutral target instead [synthesis].
Cultural mismatch. Self-congratulation, expressing joy outwardly and self-focused activities may clash with the client's norms. Offer other-focused activities such as gratitude letters and kindness [source: Sin & Lyubomirsky 2009; Kennelly 2012; Layous & Lyubomirsky 2012].
Comparison and envy (best possible self, downward comparison). If the client starts comparing themselves with others or feels a painful gap, refocus on their own values and small next steps [synthesis].
Gains fade after the programme ends. This happened after the 2005 gratitude visit (gone by three months) and after the LKM workshop. Plan maintenance from the start: choose a core practice, schedule booster check-ins, and keep a written menu the client can return to in hard times [source: Seligman et al. 2005; Fredrickson et al. 2008; Layous & Lyubomirsky 2012].
Harms monitoring. Harms of PPIs are seldom measured; this is not established in the sources, so it is [uncertain]. Track symptoms routinely (for example a standard depression measure each session), ask directly about any negative effects of each exercise, and stop any exercise that consistently lowers mood [synthesis].

Sources

Sources

Further reading (not drawn on) [uncertain where relied on]

Bryant, F. B., & Veroff, J. (2007). Savoring: A New Model of Positive Experience. Lawrence Erlbaum.
Emmons, R. A., & McCullough, M. E. (2003). Counting blessings versus burdens. Journal of Personality and Social Psychology, 84, 377–389.
King, L. A. (2001). The health benefits of writing about life goals. Personality and Social Psychology Bulletin, 27, 798–807.
Lyubomirsky, S., Sheldon, K. M., & Schkade, D. (2005). Pursuing happiness: The architecture of sustainable change. Review of General Psychology, 9, 111–131.
Rashid, T., & Seligman, M. E. P. (2018). Positive Psychotherapy: Clinician Manual. Oxford University Press.
White, C. A., Uttl, B., & Holder, M. D. (2019). Meta-analyses of positive psychology interventions: The effects are much smaller than previously reported. PLoS ONE, 14(5), e0216588. (key source; an evidence reanalysis, not used for procedures.)

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