Adapting cognitive behavioural therapy for adolescents with psychosis: insights from the Managing Adolescent first episode in psychosis study (MAPS)

ABSTRACT Background Onset of psychosis commonly occurs in adolescence, and long-term prognosis can be poor. There is growing evidence, largely from adult cohorts, that Cognitive Behavioural Therapy for Psychosis (CBTp) and Family Interventions (FI) can play a role in managing symptoms and difficulties associated with psychosis. However, adolescents have distinct developmental needs that likely impact their engagement and response to talking therapy. There is limited guidance on adapting CBTp to meet the clinical needs of under-eighteens experiencing psychosis. Method This educational clinical practice article details learnings from therapists and supervisors working with young people (aged 14–18 years) with psychosis during the Managing Adolescent first-episode Psychosis: a feasibility Study (MAPS) randomised clinical treatment trial, supplemented by findings from nested qualitative interviews with young people receiving CBTp. Results Suggested are given for tailoring CBTp assessment, formulation and interventions to meet the developmental and clinical needs of adolescents with psychosis. Developmentally appropriate techniques and resources described. Conclusions Early indications from MAPS study indicate this developmentally tailored approach is an acceptable, safe and helpful treatment for young people with psychosis. Further research is needed to develop empirically grounded and evaluated CBTp for adolescents.


Introduction
Onset of psychosis typically occurs in adolescence and early adulthood (Jones, 2013). The period of adolescence confers considerable vulnerability to mental health difficulties. Adolescence is characterised by substantial psychological, biological, and social developments formative in navigating transition to adulthood. These developmental advances are associated with riskier impulsive behaviours, increased self-consciousness, heightened regard for peer acceptance, and sleep disturbance (Blakemore, 2019); circumstances under which paranoia and psychosis can flourish.

Method
This paper aims to disseminate clinical practice learnings to help tailor CBTp to meet the developmental needs of adolescence with psychosis. Learnings are drawn from a group of highly specialist trial therapists and expert supervisors delivering CBT to adolescents (aged 14-18 years) with firstepisode psychosis as part of the Managing Adolescent first-episode Psychosis: a feasibility Study (MAPS) randomised clinical treatment trial conducted in England (Morrison et al., 2021, 1 supported by findings from nested qualitative interviews investigating treatment views of YP and family members who received this psychological treatment (For further information, see Byrne et al., 2020).
Within the MAPS study, trial therapists delivered CBTp to 39 adolescents randomly allocated to receive psychological intervention either alone or alongside anti-psychotic medication. Psychological intervention used a specific cognitive model guided by "a manualised treatment protocol to guide delivery of evidence-based cognitive therapy for people with distressing psychosis" (Morrison, 2017). This allowed an individualised approach incorporating a process of assessment and psychological formulation of problems and goals, which guided specific interventions focusing on developmental and maintenance factors. To adapt CBTp for adolescents, trial therapists drew initiatives from assertive outreach approaches developed from youth work principles (e.g. Fowler et al., 2019), and neuro-developmental theories of adolescence (e.g. Blakemore, 2019).
Trial therapists offered up to 26 weekly sessions of individual CBTp (medium attended 14.5) over a 6-month treatment period with 4 optional booster sessions in the subsequent 6 months. Up to 6 optional sessions of FI were offered, generally delivered by the same therapist, in tandem to match the pacing and content of CBT sessions. Fidelity to protocol was ensured through session-content adherence checklists, regular expert supervision and competence rating of recorded sessions using the Cognitive Therapy Scale-Revised (Blackburn et al., 2001).

Results
This article aims to provide practical, accessible guidance on tailoring CBTp to optimise engagement with adolescents with psychosis. Suggestions for techniques and resources to accommodate CBTp assessment, formulation, and interventions to meet the specific developmental and clinical needs of adolescents experiencing first-episode psychosis are detailed. Key socio-cognitive developmental and systemic factors common to adolescents that may impact engagement and progress with CBTp are described, along with suggested adaptations for each phase of CBTp delivery as follows: phase 1: Assessment and engagement (including creating focus, building engagement and involving others, monitoring and motivating change, and potential challenges to working with adolescence); phase 2: Formulating maintenance factors and change strategies; phase 3: Longitudinal formulations and CBTp; phase 4: Consolidation and promoting "Staying Well". These adaptations can be applied flexibly using clinical judgment, with the aim to build engagement, motivate change, and overcome challenges specific to delivering CBTp with adolescents experiencing psychosis.

CBTp phase 1: assessment and engagement
CBTp commences with assessment of presenting difficulties to identify precipitating and predisposing factors, triggers, appraisals, emotions, and responses. It is key to incorporate understanding of the broader socio-demography, cultural systems and generational subcultures that interact and impact a young person's needs and presenting problems. Consider the nature and quality of family and peer circumstances, as well as social, educational, or work environments to identify contextual factors that exacerbate or ameliorate symptoms or hinder therapeutic engagement and progress. This holistic view helps inform selection of goals and change strategies.

Creating focus: devising a problem list and generating goals
To create therapeutic focus establish a problem list and person-centred goals (ideally by the third session). Resolution of psychotic symptoms may not be the primary focus of CBTp, particularly if already reduced by medication. It is appropriate to select goals unrelated to psychosis if this focus promotes gains in a young person's mental health. Within the MAPS trial, YP frequently identified comorbid mental health and personal problems as their therapeutic objectives (e.g. confidence building, managing peer relationships and social isolation, boosting concentration, substance misuse, self-harm). If non-psychotic difficulties, such as panic attacks, were prioritised the therapist would utilise the relevant evidenced-based cognitive model to inform treatment.
Optimise engagement by collaboratively identifying meaningful goals that match the young person's values. MAPS participants highlighted that breaking down their difficulties into tangible, manageable components helped spark interest and alleviated hopelessness that their problems were insurmountable. Rank problems by motivation or prioritise goals that permit early success such as developing coping strategies. Early improvements help build confidence in therapy and their ability to approach more challenging difficulties. Figure 1 contains examples of problems selected as treatment targets as part of the MAPS trial.

Building engagement
YP are particularly susceptible to public stigma about mental health, potentially increasing concealment of distress and reluctance to seek help. Many YP with FEP will have no or limited prior experiences of mental health services or therapy. The first task is to engage YP and create a safeenough space for them to engage in what therapy asks of them, and to feel motivated enough to make changes.
Clinicians should explicitly provide an overview of what CBTp will involve and what is required of them, as well as inviting consideration of what they want from therapy. Use clear, relatable language to highlight the structured, collaborative, and goal-focused nature of sessions. It is imperative to be transparent outlining confidentiality and seeking consent about necessary sharing of information if safeguarding concerns arise. This helps avert therapeutic rifts and instils confidence that disclosures will not be unnecessarily shared. Clinicians should offer an interactive therapeutic approach and be flexible with practicalities of appointments (Byrne et al., 2020). Outdoor therapy (with consideration given to confidentiality) can enable greater shared ownership of the therapy space and relationship (Cooley et al., 2020). Over a third of MAPS therapists suggested a longer therapy window would help build engagement and accommodate periods of disengagement, academic examinations, and the impact of risk on therapy (Morrison et al., 2021).
YP new to mental health services may be receptive to information about service provision and psychoeducation about psychosis. Normalising information can powerfully reduce the impact of stigma, potentially helping adolescents feel safer and willing to engage, as noted by Byrne et al. (2020): I think it's really good that there was somebody out there who could say actually you know what this is normal, and there's lots of people who experience it" (F12, AP+PI) Within MAPS, adolescents commonly requested age-appropriate information about youth mental health and voice-hearing, particularly recovery stories and personal accounts from other YP, celebrities, or sports players. Whilst existing adult-focused resources can be adapted to improve relevance and appeal to YP; there is a plethora of freely available, well-designed, and informative teen-specific resources which provide accessible and reassuring psychosis-related information (in both written and video format). Examples at the time of writing include Voice Collective; Intervoice; Hearing Voice  Network, Understanding Psychosis: A guide for young people and their supporters. Signposting can help avert anxiety caused by unhelpful online searches by this internet-savvy generation. Disseminating information to worried family or friends can boost their ability to support.

Involving others: family intervention for psychosis and informal involvement
Clinical guidelines for YP and adults with schizophrenia and psychosis recommend offering FI in conjunction with CBT, whilst acknowledging the limited evidence for YP (National Institute for Health and Clinical Excellence [NICE], 2013, National Collaborating Centre for Mental Health and the National Institute for Health and Care Excellence, 2016). Since many YP live with and receive close support from family members, and peer-influence is high, involving others potentially bolsters therapeutic progress. Byrne et al. (2020) found that despite potential for upset, FI was valued for enabling discussions that improved family members understanding of the young person's difficulties, in turn facilitating improved communication and support: "the family session was a chance for me to tell them what I'm going through and a chance for them to tell me what I've been doing wrong, and what I've been doing right" (YP06, PI). Within MAPS, the primary aim of FI was involving family members in supporting the individual's progress. Early family sessions helped assess the family's understanding of presenting difficulties and, with the young person's consent, sharing information about therapeutic goals and formulation. FI goals commonly focused on improving family relations by identifying and changing unhelpful patterns of interaction and communication styles. Families who received MAPS FI reported that receiving recovery-oriented information and signposting to support networks helped promote optimism (Byrne et al., 2020).
Notably, nearly half the YP or their families participating in MAPS were unwilling or unable to commit to optional FI sessions (Morrison et al., 2021). This highlights the need for a flexible approach to involving others in terms of length, location, type of delivery, and ensuring YP hold some autonomy in their treatment decisions.
The decision to involve others or share-specific information with a wider network requires careful consideration and should be openly negotiated with a young person. To invite discussion about wider network, it can be helpful to ask YP where they sleep (rather than where they live). Clinicians can invite collaborative evaluation of potential advantages and disadvantages, considering the balance of desires for inclusion versus privacy. There are many potential benefits of involving others (to supplement CBTp or through FI). Early in therapy, if a young person is ambivalent or nervous, invite family members, carers, partners, or friend to join part of the session. This can build confidence, elicit useful dialogue, and allow sharing of relevant information. Ideally reserve time for one-to-one discussion with the young person to allow disclosure of information they may not wish to share with others (such as drug use, problems at school, domestic abuse). See, Figure 2 for a case example illustrating assessment and engagement.

Monitoring and motivating change: use of outcome measures
Validated outcome measures can help assess the presence and severity of symptoms and monitor symptom-related change. Although many standardised questionnaires are validated on norms derived from adult populations, they can be used pragmatically with adolescent populations. Symptom-specific measures can provide concrete means of demonstrating and reflecting on symptom change (such as the revised Beliefs About Voices Questionnaire (BAVQ-R; Chadwick et al., 2000); Voice Power Differential Scale (VPDS; Birchwood et al., 2000); Bird Checklist of Adolescent Paranoia (B-CAP; Bird et al., 2020). Also consider utilising measures for co-morbid problems and social issues such as improving relationships and functioning (e.g. First-Episode Social Functioning Scale for early psychosis; Lecomte et al., 2014).
Fornells-Ambrojo et al. (2017) found that YP expressed less satisfaction with completing sessional outcome measures compared to other service users. To boost receptiveness, select measures that match the young person's therapy targets, explain rational for using outcome measures, and seek was initially reluctant about the therapist liaising with school but agreed to explore advantages and disadvantages this may offer.
(*a hybrid of anonymised presentations) Laura* is 15 years old. For the past 9 months she has been hearing critical voices. The voices say, "You are lazy"; "They are following you" and tell her to hurt herself. She sees a shadowy figure, mainly at night or when out walking. She describes people watching and following her, and thinks she is being targeted because people want to hurt her. This started when her friend spread rumours about her after an argument.
Laura struggles to get to sleep and has nightmares. She feels low in mood and highly anxious, so avoids going out. When she leaves her house, she wears a hood up and watches for signs of being followed. Over the past year she has lost confidence and withdrawn from friends. She spends most of her time watching YouTube videos and worrying about people harming her. Laura lives with her mother, Gran and 3 younger siblings. As a young child Laura witnessed domestic abuse. She has a turbulent relationship with her father. She is a conscientious student and talented dancer but has been avoiding classes due to her fears. Engagement and socialising: Laura was nervous about attending therapy, so sessions were arranged at home and her mother invited to join the initial 10 minutes. Guiding principles of CBTp were introduced and Laura was encouraged to be actively involved and ask questions.
Developing a problem list and goal setting: By session 3, Laura had identified her key problems and prioritised goals of being less bothered by the voices, feeling safer and more confident leaving the house. She aspired to get a place at college, so needed to attend school classes regularly and concentrate despite the voices and worries. Other goals were to re-build her social life and improve her mood and anxiety.
Sharing psychoeducational information: Laura's fears about "having gone crazy" were explored, utilizing the Beliefs about Voices Questionnaire, and videos of other young people with similar experiences to help normalise her experiences and reduce her fears.
Involving others: Laura felt supported and protected by her mother. Discussions of who could help support her resulted in Laura inviting her mother to attend the last 10 minutes of sessions, alongside monthly FI sessions with her mother and younger sister. Laura feedback from the young person about their acceptability and utility. Online or smart-phone delivery may be preferred by YP. MAPS therapists routinely designed idiosyncratic visual analogue scales and ratings of subjective units of distress to monitor change and support developing insight. Feedback noted YP generally found such scales intuitively user-friendly and helpful.

Potential challenges encountered working with adolescents experiencing psychosis
Trial therapists encountered a range of challenges specific to working with adolescents which impacted therapeutic progress. These potential barriers, along with suggestions to navigate such challenges, are documented in Table 1.

CBTp phase 2: formulating maintenance factors and change strategies
Within a CBT approach, formulations encompass key hypotheses about the causes, mechanisms, triggers and maintaining factors contributing to a person's difficulties. A key objective within CBTp is to evaluate a person's appraisal or response to their difficulties as helpful or unhelpful. This may lead to modification and motivate action towards identified goals. MAPS trial therapists nearly always developed a shared maintenance formulation by session 3, with around half developing a comprehensive shared longitudinal formulation by session 26 (Morrison et al., 2021).
Formulating style should be adapted to accommodate cognitive and socio-affective capacities. Using the young person's own language in formulations promotes feeling heard and avoids misunderstandings. Support YP to access key appraisals and associated affective responses through in-vivo experiments or imaginatively designed thought diaries. Consider using smart technology to prompt or record (such as voice memos).
Involving others can provide useful insights. For example, third-party observations can illuminate reactions to aversive situations (such as observing hypervigilant checking, or peers recalling instances where the young person seemed distracted or left early). It may be relevant to incorporate significant others(s) thoughts, feelings, and behaviours into formulations to highlight how their responses may inadvertently maintain difficulties over time (for example, offering reassurance, providing lifts so the young person can continue to avoid public transport). This can lead to generating more helpful ways to support the young person.
To develop understanding of likely maintaining factors, clinicians should start simply and scaffold discovery learning. This might involve conducting a simple functional analysis placing triggers, thoughts, feelings, and reactions in columns. Once a young person is familiarised with linking their cognitions, emotions and responses; this framework can be used to identify safety-seeking behaviours (maintenance factors) which act as barriers to achieving their goals. This leads to inform interventions that aim to discover or reinforce more adaptive cognitive, behavioural, and interpersonal tools that promote a sense of control and safety, reduce distress, or increase functioning (in line with goals). This approach can then be replicated to address other maintaining factors, encouraging the young person to take an increasing lead, and generalising learnings beyond therapy. See Figure 3 for case example of developing a maintenance formulation.
The process of assessment and developing a formulation guides the choice and application of interventions to match the needs of a young person. Morrison (2017) details a range of change strategies including cognitive strategies (e.g. evidential analysis), metacognitive strategies (e.g. worry postponement) and behavioural strategies (e.g. behavioural experiments), as well as an emphasis on between-session ("homework") tasks. See Figure 4 for case example of intervention strategies.
Clinicians may encounter age-specific motivational or systemic barriers to therapeutic change. Adolescents may have limited control over their environment or decision-making (e.g. due to rigid educational schedules, lack of personal space or financial independence). Similarly, systemic factors may also restrict a young person's repertoire of coping strategies compared to adults (perhaps Table 1. Potential barriers to delivering CBTp with adolescents with psychosis and approaches to address these challenges.

Potential barriers (*)
Suggested approaches to navigate challenges (1) Barriers to engagement Engagement may be low, particularly if help-seeking is initiated by others. Adolescents are more susceptible to peer pressure and stigma, typically hold a shorter-term perspective, and strive for independence from adults, so may conceal difficulties. An age-power imbalance between therapist and young person may create a barrier. Some YP may display difficulty communicating or appear distracted (potentially by hearing voices or paranoid ideations) during session.
• Agree initial, short-term contract (6-8 sessions) with reviews. Consider offering twice-weekly sessions to initiate early change and bolster engagement. Be flexible with session practicalities. Get out and about together. Arrange between session contacts or send reminders to garner momentum • Personalise goals and therapy directly to the young person's interests/ hobbies • Use personalised outcome measures to monitor and demonstrate change • Maximise self-efficacy and prioritise true collaboration. Use Socratic and peripheral questioning with genuine curiosity to encourage self-generated discovery. Avoid outright challenging • Use age-appropriate language. Routinely invite and address feedback, and work to redress age-power imbalance.
• Explicitly encourage young person to raise in-session anomalous experiences. Use these as opportunity to elicit info to help understand their experiences. Support young person to experiment with different ways of responding. Ask direct questions such as, "Are you worried that I'm trying to harm you?". Routinely invite feedback.
(2) Developmental level Adolescents will have varying levels of cognitive and emotional maturity and interventions should be tailored accordingly. Some YP may struggle with emotional literacy, difficulty articulating, severe distress, or poor attention.

Potential barriers (*)
Suggested approaches to navigate challenges (4) Case complexity and symptom severity Co-morbid, complex difficulties may severely impact levels of distress and functioning. Common issues for adolescents include difficulties with emotion regulation, sleep, substance misuse, interpersonal difficulties, anti-social behaviour.
Working with a vulnerable and complex client group likely has an emotional toll on clinicians.
• Use disorder-specific recommended interventions when co-morbid difficulties are the prioritised goal • Pay particular attention to assessing and improving sleep -a risk factor for both developing and exacerbating psychotic experiences a partial factor in the greater reliance on cannabis use in teens). For YP who are reluctant to test new adaptive responses, clinicians should use motivational approaches to collaboratively appraise what can feasibly be achieved. Explore perceived risks of change weighted against potential gains, where possible leading to evaluation through a behavioural experiment. Consider support from peers or family, or between-session text encouragement and prompts.
To help overcome ambivalence, the target of change needs to be meaningful and appealing to the YP. Engaging an adolescent via their personal interests (such as gaming, music, art, sports) can be helpful, as can embedding strategies and explanations within these contexts (e.g. "What would your video game character do in this situation?", "How would an athlete improve a skill?").
A central focus of sessions with Laura was identifying connections between her thoughts (appraising her anomalous experience as a critical voice or a threat warning), feelings (fear), and behaviours (social withdrawal, hypervigilance to threat).

Functional analysis of recent incident helped identify triggers and understand how
Laura was interpreting and reacting to her anomalous experiences. Laura drew out colourful maintenance cycles using her own words (e.g. hypervigilance "running a scan"), discovering whether her appraisals and actions helped or hindered reaching her desired goals. This understanding underpinned efforts to replace unhelpful responses with more adaptive cognitive, behavioural, and interpersonal strategies.
Diagram of a maintenance loop: Safety-seeking behaviour (Avoidance) Progress is more likely if active efforts and testing is attempted between sessions. Explaining this rationale to YP can be instrumental in initiating early change. MAPS participants noted that setting between-session tasks for both themself and the therapist emphasised the shared commitment to improve their well-being, and in turn boosted their enthusiasm to complete tasks. Between-session tasks need to be meaningful, relevant, and manageable (and be cautious about using the term "homework"). Byrne et al. (2020) identified YP found gaining new ways of thinking about and responding to distress particularly helpful: "like I will feel something and then I'll end up going in the same circle of my actions, whereas when someone's offering you a new way it might change how you do it" (YP03, AP+PI).
Optimise motivation by ensuring behavioural interventions are developmentally tailored. For example, if working to re-build social connections through graded exposure, consider agespecific expectations about pleasure and success. Creative active-testing approaches can encourage adolescents to develop coping strategies, such as experiential trials of attention training or active-mind techniques to help manage distressing voices i.e. visual, auditory, or physical tasks with a high cognitive load such as reciting song lyrics or poems, skipping, shadow boxing. Other popular tools to manage hallucinations included absorbing mental imagery (e.g. a favourite place evoking positive affect, olfactory distractors with strong, pleasant smells or tastes such as sour candy) or use of immediate sensory feedback (e.g. launching an object through a visual hallucination).
After collaboratively identifying the likely role of avoidance in keeping her fears going (See Figure 3), Laura collaboratively designed a behavioural experiment to test the impact of dropping safety-seeking behaviours. She investigated what happened if she went out without her hood up and trialling looking around her environment. This allowed her to discover that others were not following or staring at her. She felt safer to test returning to enjoyable social activities including her dance class.
Developing alternative coping skills: Laura drew out an alternative cycle incorporating new coping strategies that helped her feel safer (including listening to reggae music, 'motto' reminders to challenge unhelpful cognitive biases). She kept this on her phone, referring to it when feeling scared about attending school.
Involving others: Laura gave consent to share our formulation conceptualising links between avoidance, safety-seeking behaviours, and anxiety with her mother and sister. Laura's mother gradually reduced her presence to allow Laura to test out fears of being harmed. Laura's sister supported her to rebuild socialising and hobbies. The school Safeguarding Lead agreed to ensure anti-bullying policy was followed.
Consolidating learning: Laura documented therapy learnings and helpful coping tools in a video blog and illustrated booklet as a reminder for 'Staying Well'. Another key CBTp change strategy that may require tailoring with adolescents is addressing metacognitive beliefs (such as positive beliefs about paranoia, rumination or worry). Teenagers have varying levels of emotional and verbal literacy, dependant on their developmental stage of abstract reasoning, meta-cognition, and social awareness. Bear in mind that people who have experienced developmental trauma tend to have higher rates of memory and attentional difficulties. Some may benefit from greater scaffolding, or utilising apps on smart devices that support development of metacognitive coping strategies such as postponing perseverative rumination. The NHS Apps Library is a useful source of online tools to support mental health and well-being (e.g. "WorryTree" for rumination or "CalmHarm" for managing self-harm ideation). YP living in adversity may benefit from support acquiring problem-solving skills to help damage-limitation or overcome barriers to progressing in therapy.

CBTp phase 3: longitudinal formulation
Longitudinal formulation is the collaborative process of developing a historical formulation linking life experiences to beliefs formed. Such formulations synthesise complex information into a dynamic understanding that is used to guide therapeutic practices, bridging content between sessions and across the course of therapy. Trial therapists aimed to devise and share a formulation in supervision by session 5. However, sensitivity and care are required to decide the extent and timing of engaging in this as a shared process with YP. Collaboratively developed longitudinal formulations were developed with only around half of the YP, typically around session 16 onwards (after working at maintenance level). Whilst some YP goals remained focused on current coping, others prioritised building their understanding about potential causes of their "unusual experiences". Shared formulation can be useful if therapy is stuck, or where clear links to trauma exist. Change strategies at this phase may involve schema change methods (Padesky, 1994). It is possible that adolescent core beliefs may be more flexible and amenable to change, since they have been subjected to a shorter period of confirmatory biases in comparison to adults. See Figure 5 for case example of longitudinal formulation.

CBTp phase 4: consolidation and promoting "staying well"
As with adults, recognising progress is a central aspect of change. Throughout sessions, invite adolescents to reflect and summarise key learnings to help cement understanding and avert relapse. Routinely ask and be responsive to feedback, enquiring if anything important has been missed or could be approached differently. Creative approaches to consolidate young people's learning are crucial. If the YP is distracted or has poor attention, record therapy sessions or create videosummaries of key learnings that can be re-watched and added to. Discuss security of recordings, particularly if sensitive information is disclosed. Consider using technology to set electronic calendar reminders to practice or reinforce more adaptive coping strategies.
Within MAPS, therapy blueprints were developed to support maintenance of gains, with booster sessions offered to facilitate consolidation. Summaries of learnings are more powerful if collaboratively created, and creativity amplifies their memorability and encourages a young person to revisit it; all are central to "staying well". To aid comprehension and retention, explore the young person's preferred style of creating a lasting reminder of their progress and coping tools. MAPS participants expressed preference for creative formats, rather than long (unread) reports. Example formats included video blogs summarising the main learnings and action plans to continue progress; text message or bullet-point summaries including drawings, images, memes or mottos; graphic novels, comic strips or cartoon sketches; photographs; letter to future self, and cue-card prompts of helpful coping strategies.
Clinicians should explore who will continue to be involved with supporting a young person to stay well, and help identify a clear, specific outline of what their ongoing supporting role will entail.
Mid-way through therapy, prompted by recognising how past life events were blocking progress, Laura expressed her desire to understand more about why she was having "unusual experiences". This prompted shared formulating how earlier life experiences had informed her beliefs about safety, her appraisal of anomalous experiences, and her attempts to cope. This promoted reflection that her responses were understandable (although perhaps no longer helpful), and prompted opportunities to develop alternative, more helpful coping informed by this new learning.

Conclusion
This article describes several approaches for tailoring CBTp assessment, formulation, and interventions to meet the development needs of adolescents with FEP.
Clinical learnings, developed in the context of a methodologically rigorous clinical trial, are shared including techniques to build engagement, involve others, monitor and motivate change, and suggestions of age-relevant resources. Potential challenges that may be encountered working with adolescents experiencing psychosis are highlighted, along with suggestions for addressing these.
Whilst the primary outcome of the MAPS study was to determine feasibility, both quantitative and qualitative findings provide early indications this psychological intervention (CBTp plus FI) delivered either solo or in combination with pharmacological treatment is an acceptable, safe and helpful treatment for YP with first-episode psychosis, seeming to provide benefit in terms of symptoms (Positive and Negative Syndrome Scale total score) and recovery (Questionnaire about the Process of Recovery total). Most YP showed clinical improvement over time, with ten (63%) of 16 participants in the psychological intervention group, five (28%) of 18 in the antipsychotics group, and 11 (65%) of 17 in the combined group showing at least 25% improvement in PANSS total score at 6 months (analysed by intention to treat). There was a high rate of adherence to psychological intervention (defined as six or more sessions of CBT; in 32 [82%] of 39 participants in the monotherapy and combined groups. No findings suggested that psychological interventions in the absence of antipsychotic medication were detrimental (See, Morrison et al., 2020Morrison et al., , 2021 for detailed findings).
Participant accounts of CBT in Byrne's qualitative study highlight largely positive views of interpersonal engagement with therapists, with YP and families viewing CBTp as an interactive approach helpful in building understanding of psychosis and symptom reduction, along with enhancing functioning and coping, although some found it emotionally and cognitively challenging (See, Byrne et al., 2020 for further details).
Importantly the presentations of adolescent psychosis and the cultural context in which they occur are widely variable, so these proposed adaptations are offered as considerations to be personalised for each young person's presenting needs. To finish on a note of caution, whilst there is a growing evidence base for CBT for adolescents, primarily for anxiety disorders , there is limited research exploring the effectiveness of CBTp for adolescents (Anagnostopoulou et al., 2019). Future research is needed to further explore the efficacy and acceptability of CBTp in adolescents, as well as building evidence-based clinical guidance to support and train clinicians to deliver CBTp to meet the developmental needs of each young person. Note 1. The MAPS trial aimed to establish feasibility of conducting a large-scale trial to assess efficacy of antipsychotic medication and psychological therapies for adolescents with first-episode psychosis. For details of the trial protocol see Pyle et al. (2019), for findings of the RCT controlled pilot and feasibility study see Morrison et al. (2020); Morrison et al. (2021), and for findings of nested qualitative interviews with young people and family see Byrne et al. (2020).

Disclosure statement
No potential conflict of interest was reported by the author(s).

Funding
This work was supported by the National Institute for Health Research [15/31/04].