The service user experience of SlowMo therapy: A co‐produced thematic analysis of service users’ subjective experience

Abstract Objectives SlowMo is the first blended digital therapy for paranoia, showing significant small‐moderate reductions in paranoia in a recent large‐scale randomized controlled trial (RCT). This study explored the subjective service‐user experience of the SlowMo therapy content and design; the experience of the blended therapy approach, including the triangle of the therapeutic alliance; and the experience of the digital aspects of the intervention. Design Qualitative co‐produced sub‐study of an RCT. Methods Participants were 22 adult service users with schizophrenia‐spectrum psychosis and persistent distressing paranoia, who completed at least one SlowMo therapy session and a 24‐week follow‐up, at one of 3 sites in Oxford, London, and Sussex, UK. They were interviewed by peer researchers, using a topic guide co‐produced by the Patient and Public Involvement (PPI) team. The transcribed data were analysed thematically. Multiple coding and triangulation, and lay peer researcher validation were used to reach a consensus on the final theme structure. Results Six core themes were identified: (i) starting the SlowMo journey; (ii) the central role of the supportive therapist; (iii) slowing things down; (iv) value and learning from social connections; (v) approaches and challenges of technology; and (vi) improvements in paranoia and well‐being. Conclusions For these service users, slowing down for a moment was helpful, and integrated into thinking over time. Learning from social connections reflected reduced isolation, and enhanced learning through videos, vignettes, and peers. The central role of the supportive therapist and the triangle of alliance between service user, therapist, and digital platform were effective in promoting positive therapeutic outcomes.


Practitioner points
• Service users with psychosis are able to use technology in therapeutic settings, with clinician support, to reduce paranoia and enhance well-being outcomes in daily life. This does suggest that therapies for people with psychosis can be improved by blending digital technology with face-to-face sessions. • The role of the supportive therapist is central to the triangle of alliance between therapist, service user, and digital platform in blended therapy delivery for psychosis: The therapist aids engagement with the therapy and the technology; whilst the digital components reinforce the therapy. • Slowing down for a moment is a core active element of the SlowMo therapy to reduce paranoia, but learning to slow down ones thinking process takes time and practice. • The opportunity to learn from the vignettes and video stories of peers with the same lived experience was also critical to the experience. For some, this importantly reduced the sense of isolation as people realized they were not alone with their experiences.
of traditional cognitive behaviour therapy (CBT) for psychosis therapies have revealed only smallmoderate effects on delusions and positive symptoms (e.g. Bighelli et al., 2018). Small to moderate treatment effect sizes have also recently been found for the impact on the paranoia of briefer causal-interventionist therapies that specifically target sleep, worry, and self-schema, with much greater effects on the specifically targeted process (Freeman et al., 2014(Freeman et al., , 2015a(Freeman et al., , 2015b. However, the psychological mechanisms underpinning paranoia, also comprise reasoning biases of jumping to conclusions (fast decision making based on limited evidence), and reduced belief flexibility (metacognitive ability to reflect on and adjust beliefs) (Garety & Freeman, 2013;Garety et al., 2005;. Targeting these mechanisms, in a brief engaging, digitally supported intervention might enhance both engagement and paranoia outcomes. SlowMo therapy takes a causal-interventionist approach, focusing on underlying causal mechanisms and is the first blended (therapist delivered and technology-enhanced) digital therapy for paranoia. It involves 8 cognitive-behavioural sessions that target 'fast thinking' reasoning biases that are thought to underlie paranoia (Garety et al., 2015), by encouraging people to slow down for a moment and find ways of feeling safer. Sessions are assisted by the SlowMo 'webapp', delivered via touchscreen laptop, which has interactive features including animated vignettes and personalized thought 'bubbles', and by a mobile phone app which provides access to SlowMo strategies in daily life. The therapy is brief, so has the potential to support access to therapy for a larger number of service users than current provisions, and is designed in line with recommendations for improving implementation of digital therapies for psychosis (Allan et al., 2019;Berry et al., 2019;Sarkar et al., 2016). The structured blended approach, with face to face sessions supported by session-by-session digital content reduces the risk of therapist drift (Kooistra et al., 2016), and the inclusive human-centred-design , aims to ensure the therapy is usable, trustworthy, enjoyable, personalized, normalizing, and offers flexible interpersonal support. The recent large-scale SlowMo randomized controlled trial clearly indicated that SlowMo was beneficial, with 10 /11 paranoia measures at 12 weeks, and 8/11 at 24 weeks demonstrating significant small-moderate effects in 181 participants with schizophrenia-spectrum psychosis in London, Sussex, and Oxford compared to 180 participants who received usual care alone (Garety et al., , 2021. Improvements were also found on measures of self-esteem, worry, well-being, and quality of life. In addition to the positive effects on paranoia and well-being, understanding service user experiences of therapy are also critical. The therapeutic alliance is one aspect of the service user experience, which can have a causal impact on the effectiveness of treatments in psychosis (Goldsmith et al., 2015). Indeed, alliance with online digital interventions may promote better engagement (Clarke et al., 2016). Historically, the therapeutic alliance is defined as the quality of the working relationship, or connection, between service user and therapist, that aims to produce positive therapeutic outcomes, through shared goals, tasks, and bonds characterized by interest, warmth, empathy, authenticity, genuine concern, understanding, and hope (Bordin, 1979;Henson et al., 2019;Lopez et al., 2019). In blended therapies, this working relationship is extended to a 'triangle of alliance' between the service user, clinician, and digital platform (Cavanagh, 2010); the digital therapeutic alliance being the therapeutic connection between the user and the mental health app (D'Alfonso et al., 2020). The working relationship with the therapist remains a predictor of change (Vernmark et al., 2019) but the alliance can be further enhanced by the incorporation of technology, leading to greater commitment to goals and tasks (Lopez, 2015). Alliance varies across platforms and levels of therapist involvement, and alliance with digital platforms independently predicts engagement and outcome . In SlowMo therapy, the triangle of the alliance is extended to include both the service user and therapist connection with the web app, but also the mobile phone app within and outside of sessions.
Data on the user experience of digital therapy in psychosis is only recently emerging, focused largely online and the mobile phone supported self-management (Berry et al.,2016). Service users with psychosis have reported a sense of autonomy and control while using self-guided digital health apps to manage their symptoms (Berry et al., 2019). A proof-of-concept trial found high feasibility and acceptability, and large treatment effects for a self-guided smartphone app (Acticisst) compared to a symptom tracking app (Bucci et al., 2018a), whilst a smartphone and web-based cognitive selfmanagement app (FOCUS) found that 87% of app users found it easy to use and 87% found it helpful for symptoms, but some reported difficulties with the technology and requested more technical support (Ben-Zeev et al., 2014).
There is still much to be understood about the implementation of digital interventions for psychosis. Whilst implementation frameworks have been created (Allan et al., 2019), no study to our knowledge has yet evaluated a blended therapy with digitally supported face-to-face therapy sessions for paranoia. Research has demonstrated excellent adherence to SlowMo sessions and the mobile phone app, and self-reported ease-of-use, usefulness, and enjoyment (Garety et al., 2021;Hardy et al., 2022). SlowMo therapy design was able to bridge the 'digital divide' (Robotham et al, 2016), whereby people from minority populations report lower digital literacy, as age and ethnicity did not impact user experience (Hardy et al., 2022). Given recommendations from researchers to employ multidimensional objective and subjective assessments of user experience to support implementation, in light of suboptimal uptake and use of mental health apps (Ng et al., 2019), this qualitative study evaluates service users' subjective experience of and alliance with the SlowMo therapy, including therapist, digital elements, and their interaction.

A I M
The study aimed to explore the subjective service user experience of: • The SlowMo therapy content and concepts; • The blended therapy approach (the triangle of alliance); and • The digital aspects of the intervention to inform improvements prior to future implementation.

Study design and setting
The study is a co-produced thematic analysis of service user experiences of SlowMo therapy in UK mental health services. The data collection, analysis, and interpretation were co-produced with peer researchers, to enhance the methodological rigour and provide a rich subjective perspective, as service users may be more forthcoming when interviewed by peers (Simpson & House, 2002), and peer researcher involvement in the analysis may lead to the identification of novel themes and reflections (Gillard et al., 2010(Gillard et al., , 2012. Further details of the Patient and Public Involvement (PPI) processes are described in Greenwood et al., (2021).

Participants
Participants were 22 service users recruited for the SlowMo RCT at the 3 sites (London, Sussex, and Oxford). Sampling was consecutive and purposive: participants were invited to take part in the qualitative sub-study consecutively, following completion of (i) at least one SlowMo session and (ii) the 24-week follow-up. Additional inclusion criteria were the same as for the main trial: aged ≥18 years; persistent (3+ months) distressing paranoia (assessed using the Schedules for Clinical Assessment in Neuropsychiatry [1992]; scoring >29 on the Green et al. (2008), Paranoid Thoughts Scales (GPTS -part B) [2008]; schizophrenia-spectrum psychosis (F20-29, ICD-10) [2010]; capacity to provide informed consent; sufficient spoken English to participate. Exclusion: profound visual or hearing impairment; inability to engage in assessments; currently receiving psychological therapy for paranoia; primary diagnosis of substance abuse or personality disorder, organic syndrome, or learning disability.

Topic guide
A topic guide for the qualitative interviews was initially drafted by the study team to enable a detailed evaluation of the user experience of the therapy, therapist, and technology. It was revised iteratively in collaboration with the SlowMo PPI team, initially in 2 central PPI meetings to which all 9 PPI members were invited (6 women and 3 men, from Sussex (3), Oxford (2), and London (4)), and subsequently in a series of local PPI meetings, by the PPI interviewers (1 woman in Oxford, 1 woman/1 man in Sussex, and 1 woman in London), who revised it further for flow and ease of use. See Appendix 1 for the final topic guide.

Procedure
PPI team members received either the SlowMo therapy as part of a previous project, or an introduction to the therapy and materials at the start of the current project, to enable them to better understand and contextualize the interview discussions. They also received training in peer researcher roles and roleplay practice in conducting qualitative interviews using the topic guide. Supervision was provided by the PPI lead (Sussex) or trial coordinators (London/Oxford). After gaining additional written informed consent for participation in the qualitative study, all interview data were collected in-person, either by 2 peer researchers working together (Sussex) or by 1 peer worker and a graduate researcher (London and Oxford). Participants were reimbursed £20 for their time. All interviews were audio-recorded with the exception of one (see below) and transcribed verbatim.

Analysis
A thematic analysis was applied to the transcribed data, using a constructionist framework in 6 steps: familiarization, initial coding, searching for themes, reviewing themes, defining, and naming themes, and producing the report (Braun & Clarke, 2006). The data were analysed in two phases: each comprised 11 transcripts, and used multiple coders and triangulation to reach a consensus on theme structure. In the first phase, an independent graduate psychologist, clinical, and peer researchers, and site co-ordinator/ trial therapists each coded the same transcript and met to agree with the initial coding frame. Further transcripts were coded by the graduate psychologist and clinical researcher. Codes were summarized and reviewed by the wider group to clarify the theme structure. The graduate psychologist and clinical researcher then coded the remaining transcripts to produce the phase 1 theme structure. The second phase was conducted by a second graduate researcher, mirroring the phase 1 approach. The two coding frames were then combined. Discrepancies between phases 1 and 2 were discussed, quotes were reviewed, and the consensus was reached on theme descriptors. Finally, themes and quotes were presented to the whole PPI team in two meetings across all sites for final validation.

Epistemological position
Lack of consistency and coherence in thematic analysis (Holloway & Todres, 2003) can be reduced through the transparent application of an epistemological position that underpins study findings (Nowell et al., 2017). The study is underpinned by a critical realist perspective (Bhaskar, 2009;Collier, 1994), which recognizes that whilst reality exists, knowledge is socially produced and influenced by the observer's context and worldview (Bhaskar, 2009;Ponterotto, 2005). There may be multiple equally valid accounts of the same phenomenon (Hammersley, 2004) such that reality is only imperfectly known (Letourneau & Allen, 2006;Porter, 2007). Multiple approaches were taken to best capture the reality of participant perspectives, including data collection by peer researchers, multiple coding of themes from different perspectives, triangulation which is a process of discussion to reach consensus on theme structure involving all peers and researchers, final validation, and transparency in reporting.

Stance of the PPI peer researchers
The peer researchers were not experienced in qualitative research and brought a 'lay' perspective to the approach, but they had worked as SlowMo PPI members for 1.5 years before they commenced data collection, and 2 of the 4 peer researchers had received a version of SlowMo therapy. This enabled them to empathize with participants' experiences but may have contributed bias in their interpretation of results.

Stance of the graduate coders
The primary coder in phase 1 was independent of the SlowMo study, which enabled objectivity and reduced the risk of bias, but also limited understanding of participants' responses, and required discussion with the broader study team. The primary coder in phase 2 was a SlowMo graduate research assistant, who was familiar with the intervention and the phase 1 coding but undertook phase 2 coding separately with a critically reflective stance.

R E SU LTS
Of 28 eligible participants approached in Sussex and London, 5 declined to participate, and 3 were unreachable. One did not consent to audio-recording, and notes were taken during their interview instead. Two additional participants took part from Oxford to give 22 participants, comprising 12.2% of the total SlowMo therapy sample. Basic demographic details are provided in Table 1. Some data are not presented individually to preserve anonymity. Eighteen were male (82%), 18 were White British (82%), 19 were single (86%), 17 were unemployed (77%), and 14 lived alone (64%). Only 3 participants (14%) had received education beyond A levels. Their mean age was 44.9 years (range 20-64), and their mean GPTS Part B score was 51.8 (range 29-79). The qualitative sample was broadly representative of the whole therapy sample, which had slightly fewer men (70%), slightly more ethnic diversity (70%) and unemployment (80%), slightly fewer people living alone (58%), a slightly lower average age (42.6), and slightly higher GPTS Part B score (56.2) (Garety et al., 2021).

Development and validation of theme structure
The final theme structure comprised 6 core themes and 20 sub-themes. Two core themes remained unchanged from phase 1 to 2 ('Slowing things down' and 'Improvements in paranoia and well-being'), the wording changed slightly for one ('Starting the SlowMo journey'); the wording and focus (changed slightly for another 'Approaches and challenges of Technology'). The final two themes became more distinct: 'Feeling connected and understood' became 'Value and learning from social connections'; 'Drivers of Progress' became specifically, 'The central role of the supportive therapist relationship'. Of the final 20 sub-themes, 6 were identical from phase 1 to phase 2, 9 changed wording or focus, and 5 were new in phase 2. Figure 1 provides a representation of the organization of the core themes. The initial theme captures the experience of (i) starting the SlowMo Journey. The inner two themes, depicted in orange, reflect core and unique elements of the SlowMo therapy as perceived by service users: (iii) slowing themes down and (iv) value and learning from social connections. The two flanking themes, (ii) the Central role of the supportive therapist relationship and, (v) approaches and challenges of technology, emphasize the critical connections with both therapist and technology in leading to the therapeutic outcomes of (vi) Improvements in Paranoia and well-being.
Supporting quotes for all themes and sub-themes are provided in Table 2. STARTING THE SlowMo JOURNEY People described that the SlowMo therapy was something offered and encouraged by clinicians. It felt like an opportunity to try something new and potentially helpful. It created a mix of emotions. Some people described hope and readiness, especially if they felt they had been stuck with their experiences for a long time. Other people felt nerves and uncertainty about meeting someone new, and if they struggled with voices and anxiety. Importantly, no nerves or uncertainty were expressed in relation to use of technology. For many, this was their first therapy experience.

Reasons for Starting SlowMo
Starting SlowMo felt like an opportunity offered by clinicians, as opposed to being sought by patients; as well as being an opportunity for help; and linked to feeling stuck and a desire to take part in research. Note: Ethnicity and marital status data have been removed to preserve anonymity for people who may have been in a minority status on a particular site.

Feelings before starting
Service users described feeling nervous and uncertain, but also open, willing and ready for new experiences as part of the therapy.

Voices and anxiety as barriers
Some symptoms, and specifically voices and anxiety, were barriers to starting SlowMo.

CENTRAL ROLE OF SUPPORTIVE THERAPIST RELATIONSHIP
People emphasised the importance of human interaction, of talking and being listened to by someone who was friendly and trusted, as opposed to only interacting with a computer which was thought would be ineffective. The therapist was perceived as crucial in enabling access to both the therapeutic processes and the technology.

Importance of talking and being listened to
Some people emphasized the specific value of talking and being heard.

A positive therapist relationship
Some people emphasized the importance of non-specific therapy skills such as warmth, empathy, and trust as part of their positive relationship with the therapist.

Therapist as a supportive guide
Some people valued the therapist being flexible, and providing clear explanations, and support to aid engagement with both the therapy and the technology. The therapist supported people to use the technology in and out of the therapy sessions, and the computer content in turn supported the therapist.

Challenges to using technology
S9: 'I have bought things like iPod's and Nintendo but I know the main thing is the smart phone but it's too much technology for me. I can't really be bothered to take the phone out with me' L18: 'I had my own phone and I didn't want to go around carrying two phones' S12: 'yesterday I tried to look up a few apps on SlowMo and sometimes I was trying to find something about err feeling insecure about something and I tried to find the answer that I gave myself, but I found that a little bit difficult' L19 -'umm I did find when I wrote things for the bubbles, the type was a bit big and when the bubbles got smaller I couldn't read everything it said' 6. Improvements in paranoia and well-being 6.1 Decreases in paranoid thinking and in worry S10: 'Well the paranoia has dropped quite a bit yeah. I'm not as extremely paranoid as I used to be' L21: I'm a worrier, but now I'm not a worrier as much as I was.. it slowed me down quite a lot O13: 'you do think everybody is talking about you, I mean that was the big thing that I took from it. It just made me think, 'Hang on a minute, get a grip, it's not like that at all.' That was the biggest thing that I took from it, just seeing things a bit more clearly'.

SLOWING THINGS DOWN
The central concept of slow and fast thinking was helpful; and learning a new skill was valued and integrated into thinking styles, through practice over time; but more cognitively able participants found the intervention to be too slow and proposed that delivery speed be adapted.

Slow and Fast thinking are relevant and helpful
Some people related to the idea that they were thinking too quickly, and needed to slow down and not jump to conclusions. Slowing down helped some people to calm down and was useful outside of therapy.

Learning a new thinking skill set
Some people described that they had learnt how to slow down their thinking.

Practice integrates the slow-thinking style
Some people described a need to practice the slowthinking style, and to build the habit of slowing their thinking down, over time.

VALUE AND LEARNING FROM SOCIAL CONNECTIONS
Some people talked about feeling a connection with the vignette video characters, who were viewed as peers. These connections were normalizing and helped people to feel less isolated. However, the impact went beyond normalizing, in that people described trying to emulate how they had seen the video characters responding to their own experiences.

Vignettes and videos help to feel less isolated
People described how they had related to the SlowMo vignettes and learnt that they were not alone, which made them feel less isolated.

Learning and support through vignettes and peers
People learnt from and were inspired by the SlowMo vignettes and video stories from peers, and talked about 'learning from these 3 people.' They valued the support from others with lived experiences but also wanted a greater range of vignettes. 6.4 Support with other mental health difficulties S12: It's teaching me to not sort of stress so much. Not, you know, not to get over-anxious about stuff S4: This is the first time in 5 years as I haven't been in hospital with my depression and psychosis. So I think it's really made a difference. Normally I am in hospital 3 or 4 months a year 6.5 Positive view of the future S10: 'Before SlowMo I was doomed yeah but now I've got a bit more positive outlook yeah. I can actually live a bit of life' O13: I was like, 'I'm a weirdo, a nutter,' all that kind of thing, and then you realize that there is a lot of people in the same boat, and there is a lot of nice people out there. It just gives you a more positive outlook'

Use of technolog y to support positive engagement with the therapy
The phone app was seen as a tool to aid connectedness in daily-life; the thought bubble contents were seen as guides to thinking; and the computer scenarios and games were seen as learning tools.

Cognitive demands of blended therapy as therapeutic, or overwhelming
For some people the combined cognitive and sensory demands of the blended therapy approach were seen as stimulating and therapeutic, whilst for others these were seen, at times, as overwhelming.

Personal relationship with the app
Relationships with the phone app changed over time. Paranoia and self-consciousness were barriers to use in public for some; the app was described as like a best friend for others, but people gradually moved from the app to memory. For some, the app was insufficient support on its own when therapy ended, and they wanted more face-to-face sessions or to take part again.

Challenges to using technolog y
A variety of challenges and issues with technology were described including a lack of interest in technology, limitations of the app interface or due to needing a second phone. Technical issues were noted; and improvements suggested including larger fonts, colour animations, a 'check in' rating for how you're feeling and written instructions on how to use the phone.

IMPROVEMENTS IN PARANOIA AND WELLBEING
Different people reported various different ways in which they experienced improvements in their paranoia and wellbeing, which they attributed to the therapy.

Decreases in paranoid thinking and in worry
Some people described decreases in paranoia or worry, or described seeing things more clearly.

Increased engagement with social life
Some people described that they were able to go out more, take up new leisure activities, see more people and generally increase their engagement with their social life following the therapy.

Increased confidence and perseverance
Others described feeling more confident and determined to get on with their lives.

Support with other mental health difficulties
People also described impacts on a variety of other mental health issues including anxiety, stress, panic attacks, voice hearing, and depression.

Positive view of the future
Finally, several people talked about having a more positive outlook as a result of the therapy.

DISCUS SION
This study provided an in-depth exploration of the subjective user experience of SlowMo therapy and generated insights to aid future development and support implementation. The 6 core themes captured (i) the experiences of starting the SlowMo journey; (ii) the central role of the supportive therapist as a guide to accessing the therapy and technology; (iii) the approaches and challenges in the use of the technology; (iv) key features of the therapy including slowing things down, which was learnt and internalized through time and practice; and (v) the value and learning achieved through relating to the vignette characters, which helped to normalize experiences and model coping strategies. Finally, (vi) positive impacts of the SlowMo therapy were reported for paranoia, worry, other mental health difficulties, engagement with social and daily life, confidence, and a positive outlook for the future. Primary reasons for starting the SlowMo therapy were often a sense of feeling stuck and an opportunity for help. One peer researcher noted that 'people on the SlowMo trial had not generally been offered any other therapies'. Some of the quotes make it clear that problems had never been discussed before.
Consistent with other blended therapies (Vernmark et al., 2019), the presence of the therapist during the session was viewed as central to the process. The therapist was seen as crucial in bridging the link between the service user and the technical features of the app, which in turn led to more favourable experiences of the technology, cementing the triangle of alliance (Cavanagh, 2010). The majority opinion was that the digital component of the therapy augmented the rich therapeutic relationship, as opposed to the app being seen as central (Aref-Adib et al., 2019). This is supported by a recent systematic review which found that when peer-to-peer interactions on mHealth apps were not moderated by clinicians or researchers, the retention rates slipped from very high (94.5%) to very low (14%), highlighting the role of the therapist in improving adherence (Biagianti et al., 2017). Importantly in the current study, participants also described a relationship with the phone app itself. The app reminded participants of the learning gained in therapy and became a 'best friend' for one person.
As therapy progressed, multiple participants in this sub-study, found that the interactive multimedia features of the vignettes made them feel more connected and understood, and less isolated in their experiences. Studies have shown that participants enjoy digital platforms which are tailored, personalized, and communicative (Berry et al., 2016). Some participants learned and retained their therapy skills better by observing the animated vignettes, and several participants requested further tailoring through a greater variety of characters, covering a broader set of worries that occur in paranoia. This experience of viewing others who are coping with similar experiences to oneself is an important factor that enhances acceptability and engagement with interventions (Biagianti et al., 2018).
Many participants recognized the importance of slowing down thinking and were able to modify their thinking style to be more flexible and to seek more information. This is consistent with the main RCT finding that the SlowMo therapy increased belief flexibility and slow thinking compared to treatment as usual (Garety et al., 2021).
The within-app thought bubbles helped to develop skills to slow down thinking, and were an accessible resource that offered coping strategies. Participants were more likely to use the app earlier in the therapy, when paranoia was arguably more acute, with use appearing to reduce as participants' mental state improved, and new thinking processes became internalized. This is consistent with the concept of e-attainment of personal goals when these have been sufficiently supported (Sanatkar et al., 2019).
While SlowMo offers a normalizing, supportive platform for participants, some described that suspiciousness and pre-existing views towards technology might affect use. This is consistent with previous reports (Aref-Adib et al., 2019), although importantly, baseline paranoia did not predict adherence to or self-reported user experiences of the SlowMo app (Hardy et al., 2022). The stigma surrounding mental health continued to be a barrier, especially for people suffering from paranoia, who on occasion felt selfconscious when using the app in public. Participants also described technical challenges, as expected given the trial tested a working prototype (minimal viable product) of SlowMo therapy . Technical recommendations have been integrated into a product specification for an updated version of SlowMo therapy; including improved syncing of content from computer to the mobile app, increased font size, additional instruction guide (on-boarding) for use of the mobile phone app, and coding to enable cross-platform use of the mobile app. These recommendations are consistent with previously published recommendations to support the implementation of digital health interventions, whereby interventions that are adaptable to users' needs and available on participants' own phones led to better engagement (Aref-Adib et al., 2019).
Lastly, participants reported improvements in paranoia, worry, confidence, distress, outlook, and social life, mirroring the quantitative results from the main trial which showed positive impacts of the therapy on paranoia and worry alongside other well-being, self-concept, and quality of life outcomes (Garety et al., 2021). The therapy proved to have far-reaching impacts: participants mentioned enhanced social lives, and improved co-existing conditions, in keeping with the broad pattern of improvements across secondary outcomes reported in the main trial. Participants reported increased self-confidence and better management of other stresses, which is consistent with the use of technology to promote a sense of autonomy, and for mobile phone apps to offer real-time help (Bucci et al., 2018a).
To conclude, participants of the SlowMo therapy reported a positive experience of the digitally supported therapy, reductions in paranoia, and improved overall well-being. This was linked to feeling understood, relating to vignettes, accepting and learning a new slow thinking style, and being supported by a therapist to reinforce their learning through the therapy sessions and mobile phone app use.

Strengths and limitations
This is the first study to gather detailed personal and contextual information to aid understanding of the factors influencing subjective user-experience of a specific blended digital therapy for paranoia. The data were gathered from a representative sample of over 12% of all participants randomized to SlowMo therapy. Peer researchers co-delivered the study, conducted all interviews with participants, and coproduced the final thematic analysis, which it is hoped, enhanced the robustness of the results and the validity of the service user perspective. A number of steps were taken during the course of the analysis to enhance the overall rigor of the study and limit sources of bias. The initial coding was conducted by an independent researcher, with multiple coding and triangulation to reach a consensus on the theme structure. Regular meetings involved a diverse mix of professionals, and peer researchers to ensure that participants' responses were considered from a variety of viewpoints.
The participants recruited in previous qualitative studies (e.g. Aref-Adib et al., 2016;Bucci et al., 2018b) were mostly young, digital-natives with a mean age of 28 and 26 years, respectively. A systematic review found that younger 'at risk' or first-episode psychosis individuals used the internet and mobile technologies for their mental health difficulties more frequently than those with longerterm psychosis (Killikelly et al., 2017). The mean age of SlowMo participants was 45, thus a notable aspect of the current study was the broadly positive experience of blended therapy in this older age group. This is further supported by a linked study that showed no impact of the digital divide, as neither age, ethnicity nor paranoia impacted adherence to or user experience of the SlowMo mobile app (Hardy et al., 2022).
Limitations included the limited sampling of participants from one site, and limited ethnic diversity, in this qualitative study, especially from black ethnic groups, who reported lower computer access, smartphone use, and confidence prior to therapy in a linked study (Hardy et al., 2022). In addition, only 4 participants (18%) were female. The diversity of the sample with respect to digital literacy, digital access, socioeconomic status, and cognitive ability was not investigated in this qualitative study, although it was investigated in the linked SlowMo study (Hardy et al., 2022). Although participants were invited consecutively, it is unclear whether those who agreed to take part were those who were more positive about the therapy. Finally, the derived themes reflected a majority view of the participants in this study but did not necessarily reflect the views of all participants in this study or indeed in the main trial.

CONC LUSIONS
These findings offer valuable insights into participants' experiences with SlowMo therapy. Importantly, many participants described feeling stuck prior to starting the therapy. They valued the central role of the supportive therapist who guided them through the therapy, and the use of the technology. They described that key concepts of slow and fast thinking were helpful, and they valued learning from the connections with the vignette characters. The relationship with the mobile phone app was experienced positively. Furthermore, the integration of the slow thinking style over time in a form of e-attainment (whereby technology has sufficiently supported the attainment of therapy goals or skills) may have contributed to the subjective improvements in paranoia, well-being, and social integration, and reductions in worry, stress, and depression. In this respect, the 'triangle of alliance' between service users, therapists, and digital platforms appeared to be highly effective, and there was a clear sense of a shared bond, goals, and tasks to support improved paranoia and mental well-being. In the future, blended therapies for psychosis may benefit from a wide variety of true stories and experiences on which service users' could model their recovery, to optimize impact. Important reflections were provided on the less visible personal and social barriers that affect the uptake of digital therapies such as the need for further instructions on how to use mobile phone apps, preferences for using apps on one's own phone, and the impact on usage pattern when symptoms become acute. This study in combination with the quantitative user experience study (Hardy et al., 2022) provides critical information to support the development of the next iteration of the SlowMo and other blended therapies for future implementation in clinical practice.

AC K NOW L E DGE M E N T S
The Patient and Public Involvement team members who have given permission to use their names were Alice Hicks, Angie, Dan, Amy, Helen, and Natalie (First names only), and [pseudonyms] Anthony and Alex. One PPI team member sadly died in the course of the study; she made an important early contribution, and provided intelligence, kindness, and wisdom. We would like to acknowledge the contribution of the additional research workers on the trial: Ujala Ilyas, Elâ Örücü, Valerija Lvova, Phoebe Marple-Horvat, Rikesh Halkoree, Eva Tolmeijer, Vicci Smallman, Anna East, Catherine Belton, and Michaela Rea; and the clinical teams in South London and Maudsley NHS Foundation Trust, Oxford Health NHS Foundation Trust and Sussex Partnership NHS Foundation Trust for their support. Garety, Ward, Greenwood, Hardy, Emsley, Freeman, Fowler, Kuipers, Bebbington and Dunn were responsible for concept and design of the study and securing funding. Greenwood, Gurnani, Ward, Hardy, Vogel, Vella, McGourty, Robertson, Sacadura, Rus-Calafell, Collett, Michelson and the Patient and Public Involvement team were responsible for acquisition, analysis and interpretation of the data. Greenwood, Gurnani, Garety, Ward, Hardy and Michelson were responsible for the drafting of the manuscript, and all authors provided critical revision of the manuscript for important intellectual content.

DATA AVA I L A BI L I T Y S TAT E M E N T
The data that support the findings of this study are available from the corresponding author upon reasonable request. The data are not publicly available due to privacy or ethical restrictions.