A Smartphone-Based Self-management Intervention for Bipolar Disorder (LiveWell): User-Centered Development Approach

Background Bipolar disorder is a serious mental illness that results in significant morbidity and mortality. Pharmacotherapy is the primary treatment for bipolar disorder; however, adjunctive psychotherapy can help individuals use self-management strategies to improve outcomes. Yet access to this therapy is limited. Smartphones and other technologies have the potential to increase access to therapeutic strategies that enhance self-management while simultaneously providing real-time user feedback and provider alerts to augment care. Objective This paper describes the user-centered development of LiveWell, a smartphone-based self-management intervention for bipolar disorder, to contribute to and support the ongoing improvement and dissemination of technology-based mental health interventions. Methods Individuals with bipolar disorder first participated in a field trial of a simple smartphone app for self-monitoring of behavioral targets. To develop a complete technology-based intervention for bipolar disorder, this field trial was followed by design sessions, usability testing, and a pilot study of a smartphone-based self-management intervention for bipolar disorder. Throughout all phases of development, intervention revisions were made based on user feedback. Results The core of the LiveWell intervention consists of a daily self-monitoring tool, the Daily Check-in. This self-monitoring tool underwent multiple revisions during the user-centered development process. Daily Check-in mood and thought rating scales were collapsed into a single wellness rating scale to accommodate user development of personalized scale anchors. These anchors are meant to assist users in identifying early warning signs and symptoms of impending episodes to take action based on personalized plans. When users identified personal anchors for the wellness scale, the anchors most commonly reflected behavioral signs and symptoms (40%), followed by cognitive (25%), mood (15%), physical (10%), and motivational (7%) signs and symptoms. Changes to the Daily Check-in were also made to help users distinguish between getting adequate sleep and keeping a regular routine. At the end of the pilot study, users reported that the Daily Check-in made them more aware of early warning signs and symptoms and how much they were sleeping. Users also reported that they liked personalizing their anchors and plans and felt this process was useful. Users experienced some difficulties with developing, tracking, and achieving target goals. Users also did not consistently follow up with app recommendations to contact providers when Daily Check-in data suggested they needed additional assistance. As a result, the human support roles for the technology were expanded beyond app use support to include support for self-management and clinical care communication. The development of these human support roles was aided by feedback on the technology's usability from the users and the coaches who provided the human support. Conclusions User input guided the development of intervention content, technology, and coaching support for LiveWell. Users valued the provision of monitoring tools and the ability to personalize plans for staying well, supporting the role of monitoring and personalization as important features of digital mental health technologies. Users also valued human support of the technology in the form of a coach, and user difficulties with aspects of self-management and care-provider communication led to an expansion of the coach's support roles. Obtaining feedback from both users and coaches played an important role in the development of both the LiveWell technology and human support. Attention to all stakeholders involved in the use of mental health technologies is essential for optimizing intervention development.


Introduction
Bipolar disorder is characterized by recurrent episodes of mania, hypomania, depression, and mixed states. Many individuals experience multiple acute episodes, long episode durations, and interepisode symptoms [1][2][3][4][5]. As a result, individuals with bipolar disorder are symptomatically ill about half of the time, and three-quarters of those affected never achieve full recovery of psychosocial function [1,6]. Pharmacological management is the primary treatment for bipolar disorder and effectively reduces relapse risk and symptom burden [7,8]. The addition of empirically supported psychotherapy to pharmacotherapy can further lower relapse rates, decrease symptoms, and improve quality of life [9][10][11][12][13][14][15][16][17].
Although psychotherapy delivered during research trials has proven helpful, only about half of individuals with bipolar disorder receive any therapy [18,19]. Enhancing access to content and tools from empirically supported psychotherapy is essential to improving treatment for bipolar disorder. Digital mental health technologies, including web and smartphone-based applications, provide a means to increase the availability of empirically supported psychotherapeutic strategies for managing mental health problems [20][21][22][23][24]. In addition to access barriers, current tools for bipolar disorder self-management can be improved [14,[25][26][27][28]. Relative to face-to-face treatment, mental health technologies can advance intervention functionality by providing real-time assessments, feedback, and provider alerts [29]. Many people with bipolar disorder are interested in utilizing self-management strategies to stay well, and strategies used by individuals who are doing well overlap significantly with the content of empirically supported psychotherapies for bipolar disorder [30][31][32][33]. This overlap suggests that smartphone-based interventions delivering self-management strategies derived from empirically supported psychotherapies may meet user needs and support user engagement [34][35][36][37].
To address the need for increased access to and enhancement of empirically supported therapy for bipolar disorder, we designed and developed LiveWell, a smartphone-based self-management intervention (Clinicaltrials.gov NCT02405117, NCT03088462). Description of intervention development is essential to support ongoing improvement and dissemination of technology-based mental health interventions [38][39][40][41][42], and thus, this paper describes the user-centered development of LiveWell. The development approach aims to ground LiveWell in the lived experiences of individuals with bipolar disorder to create an intervention that encourages the development and long-term use of self-management strategies for living well with bipolar disorder [43][44][45]. The user-centered development was carried out in phases, consisting of (1) an initial 12-week field trial of a simple smartphone app for self-monitoring of behavioral targets, (2) design interviews and usability testing of a self-management app, and (3) an 8-week pilot trial of the complete LiveWell intervention, including both technology and human support.

Users
The study was reviewed and approved by Northwestern University's institutional review board. Users were recruited via fliers placed at university-affiliated and private outpatient mental health practices. Eligible users were 18-65 years old and had a DSM-IV (Diagnostic and Statistical Manual of Mental Disorders-fourth version) diagnosis of bipolar disorder with a minimum of 2 acute mood episodes within 2 years of enrollment. Individuals were excluded if they (1) were not in current psychiatric care; (2) met criteria for a substance-use disorder within the last 6 months; (3) met criteria for another psychiatric diagnosis, or had symptoms for which participation in the study was either inappropriate or dangerous (including current severe suicidal ideation or a serious suicide attempt in the last 12 months); (4) were pregnant or planned to become pregnant; (5) had a visual, hearing, voice, or motor impairment that would prevent completion of the study procedures or limit smartphone use; or (6) were unable to speak or read English. As the intervention primarily targets mood episode relapse prevention, a current mood episode at the baseline assessment was an additional exclusion criterion for the pilot study.
Before an initial telephone screening, users completed informed consent by telephone or online. Users completed written consent before a face-to-face (F2F) clinic visit. Initial screening to establish a bipolar disorder diagnosis was conducted via telephone using the Mini-International Neuropsychiatric Interview [46]. If eligible, users completed an F2F interview with a study clinician (psychiatrist or psychologist) using an abbreviated version of the Affective Disorders Evaluation and the Clinical Monitoring Form [47,48]. Individuals with a confirmed diagnosis at the clinic visit enrolled in the field trial, design interview, and/or usability testing and could additionally continue to the next phase if they chose. For the pilot study, users also completed a baseline telephone assessment using the Clinical Monitoring Form to assess current clinical status. All individuals who participated in earlier phases of intervention development were offered an opportunity to participate in subsequent development phases. Users were compensated for their time and travel costs: US $10 was given toward travel costs and the telephone assessment; US $15 was given for participation in the clinical assessment, baseline and monthly telephone assessment, exit interview, and app training; and US $25 was given for the design and usability interviews.

Field Trial
A 12-week field trial was completed by 4 users to assess a simple self-monitoring smartphone app. The research team collaborated with the Center for Behavioral Intervention Technologies (CBITS) at Northwestern University to develop an Android app with self-report data collection, encryption, and transmission to a secure server. Users were provided with a smartphone with a data plan and had an F2F meeting with a study staff member (coach) who used a structured script and handouts to introduce the app (Multimedia Appendix 1). The coach used structured interview scripts to gather feedback about the training after the session and app use after the field trial (Multimedia Appendix 1).

Design Sessions and Usability Testing
Design sessions were conducted with 4 users from the initial study and 1 additional user, for which a structured script and handouts (Multimedia Appendix 2) were used to simulate an F2F app training session with a coach. Users were provided with a smartphone app mock-up (Multimedia Appendix 3), asked to imagine using the app for the next 16 weeks, and instructed to think and ask any questions out loud. The research team collaborated with CBITS to extend the self-monitoring Android app to include information and tools to help users engage in bipolar disorder self-management. The 5 users from the design sessions attended F2F usability testing sessions that employed structured scripts and scenarios (Multimedia Appendix 4). Users were given 5-10 minutes to explore the app and asked to share their general impressions. Then, users read one assigned lesson and another of their choice and were asked to provide feedback about the lesson's usefulness, length, and coverage. Next, users read aloud scenarios that mimicked real-life situations: medication nonadherence, sleeping too little, and experiencing early warning signs of depression. After reading each scenario, users completed a daily check-in based on the scenario and received automated feedback from the app based on their self-report data. Users were asked to discuss the usefulness of this feedback and how it could be improved. All users were given a posttask questionnaire to rate the overall usability of the app (Multimedia Appendix 5).

Pilot Study
To test the complete intervention, 11 users, including 4 who attended the usability testing, completed an 8-week pilot study. Users were provided with a smartphone and a data plan. They had an F2F meeting with a coach who used a structured script and handouts (Multimedia Appendix 6) to instruct them on the use of the app and the coach's role. Following this meeting, users completed 6 phone calls (weeks 1-4, 6, and 8) with a coach; the coach used structured scripts (Multimedia Appendix 6) to support app use adherence, self-management strategy use (including the development of personalized wellness plans; Multimedia Appendix 7), and communication with clinical care providers. After completing the pilot, users completed a structured exit interview (Multimedia Appendix 8) and an exit questionnaire (Multimedia Appendix 9) to provide feedback about the app's usability.

Instant Data Analysis
The research team utilized an instant data analysis approach across all development phases to make iterative changes to the technology and coaching based on user feedback [49]. This approach reduces the time needed for analysis while also identifying usability issues [50,51]. Immediately after observing, interacting with, or receiving feedback from users, study staff wrote memos documenting users' problems or comments. The design team (coaches, programmers, the project manager, and team leaders) discussed these memos until they achieved consensus on necessary changes [52]. These discussions sometimes prompted a return to the literature to provide additional information to make design decisions. During the pilot study, coaches' experiences with the technology and the users were increasingly incorporated into the design discussions and decisions. Based on the number of users, the field trial and usability studies (n=4-5) should identify 55%-85% of problems with app usability, and the pilot study (n=11) should detect 80%-95% of usability problems [53][54][55][56]. In addition to the traditionally defined users, 4 coaches and 1 team leader provided human support during different stages of the development process.

Analysis of Usability Testing Posttask and Pilot Study Exit Questionnaires
Participant responses to the usability testing posttask questionnaire (n=5) and pilot study exit questionnaire (n=11) were used to assess usability (Multimedia Appendices 5 and 9).
To provide summary assessments, responses from the 7-point response scales were collapsed into 2 categories: disagree/strongly disagree and agree/strongly agree.

Analysis of Pilot Study Exit Interviews
The exit interviews (n=11) were transcribed verbatim and used for thematic analysis [57]. Then, 3 researchers independently conducted a preliminary round of coding during which transcripts were partitioned into excerpts (transcript lines conveying a codable unit) and exported to Microsoft Excel spreadsheets (Multimedia Appendix 10). App usability subthemes were inductively coded and deductively grouped into larger themes. Coders used nominal group consensus, meeting with a moderator to discuss, clarify differences in, and finalize codes [52].

Analysis of Rating Scale Anchors
Thematic analysis was used to investigate users' personalized anchors for the mood and thought rating scales used during the field trial (n=4) and the wellness rating scales used during the design sessions (n=5) and pilot study (n = 11) [57]. Anchors were entered into Excel spreadsheets (Multimedia Appendix 11), and 2 researchers inductively coded subtypes. A third researcher reviewed the codes, and a consensus process was used to finalize anchor subtypes [52]. Anchor subtypes were then deductively grouped into broader categories (anchor types) based on a literature review describing early warning signs experienced by individuals with bipolar disorder prior to an episode [11,12]. The research team discussed the overall coding scheme and developed definitions and examples of the anchor types and subtypes. Then, 2 researchers who were not involved in the initial coding and development used these definitions and examples to code the anchor types and subtypes across all 3 scales; the joint probability of agreement was 90% for subtypes and 87% for types.

Users
At study enrollment, 12 users were included and were 21-62 (mean 38, SD 14) years old. Of these 12 users, 4 were male and 8 were female; 12 were non-Hispanic white; 3 were married or living as married, 3 were divorced, and 6 were never married; 5 had completed some college, 2 had completed college, and 5 had completed more than college; 2 were students, 6 were employed, 2 were unemployed, and 2 were on disability.

Intervention Overview
Similar to existing, empirically supported F2F psychotherapy interventions for bipolar disorder, the LiveWell intervention aims to decrease episode relapse, reduce symptom burden, and improve quality of life [3,4,[10][11][12][13][14][15][58][59][60]. The intervention seeks to achieve these outcomes by assisting individuals with managing behaviors proposed to underlie the impact of existing therapies [7,[11][12][13]15,18,19,31,61,62]. LiveWell thus emphasizes identifying early warning signs and symptoms of relapse, developing plans and monitoring for relapse, and then enacting and adjusting plans as needed. In addition, LiveWell engages users in a similar process to support taking medications as prescribed, obtaining adequate sleep duration, and maintaining regular routines. LiveWell also addresses strengthening social support, managing stressors, and engaging in healthy habits regarding diet, exercise, and substance use.
LiveWell consists of technological and human support components, including a smartphone app, a secure server, a website, and coaching support ( Figure 1). The smartphone app consists of 5 components: Foundations, Toolbox, Wellness Plan, Daily Check-in, and Daily Review. It provides foundational information on bipolar disorder self-management (Foundations) and a toolbox with self-assessment surveys and skills practice (Toolbox). The Foundations and Toolbox components support developing a personalized Wellness Plan to reduce relapse risk and manage signs and symptoms. The core of the intervention is a Daily Check-in, in which users monitor medication adherence, sleep duration, routine, and wellness. Based on Daily Check-in data, the Daily Review provides tailored feedback that directs users to relevant psychoeducation content (eg, using lifestyle skills to reduce relapse risk or coping skills for managing early warning signs and symptoms).
LiveWell also utilizes human support, a coach to improve app use adherence, self-management, and communication with mental health providers [63]. The app provides data summaries and alerts via a secure server and website to help the coach provide support and facilitate communication with mental health care providers. Personnel without professional mental health training provide coaching support to reduce costs and increase access [64,65]. A clear division of labor between the technology and the coach ensures that coaches operate within the scope of nonclinical practice. The technology functions as the psychotherapeutic strategy expert that provides status summaries and alerts to the coach, who uses structured scripts and flowsheets to serve as a technology use concierge.

Field Trial
Monitoring is a major determinant of behavior change [41] and an essential strategy of empirically supported bipolar disorder psychotherapies [3,11,25,60]. Individuals with bipolar disorder are interested in using self-monitoring tools [30,31]. Thus, the initial development of LiveWell focused on creating a smartphone-based self-monitoring tool for tracking moods, thoughts, sleep, and routine. In particular, the ability to distinguish between different levels of wellness (eg, doing well or responding as expected to events versus experiencing early warning signs of an episode) may be essential to staying well [33].
Due to the potential importance of this ability, the field-trial Daily Check-in included 7-point scales to monitor mood and thoughts ( Figure 2, Table 1). During the app training session, coaches helped users establish mood and thought anchors (ie, words describing their prior experiences at different wellness levels) to make these scales more personally relevant and useful. However, coaches noticed that users' mood and thought anchors often overlapped (eg, "planning for my future" as a mood anchor; Table 1), and some anchors appeared to reflect behaviors, physical symptoms, and changes in motivation (eg, "sluggish" as a thought anchor; Table 1). In addition, users reported that the 7-point range was too restrictive (eg, "If people are more depressed, it would probably be useful to have a wider scale to describe it"). As a result, the mood and thought rating scales were collapsed into a single 9-point wellness rating scale ( Figure 2).
Users were also given the option to complete the Daily Check-in multiple times a day, but coaches noted that allowing multiple check-ins did not appear to elicit the reflection needed to identify different wellness levels. Instead, the Daily Check-in seemed to be capturing momentary reactions to daily hassles and uplifts [66]. To encourage users to engage in reflective monitoring rather than in-the-moment rating, the Daily Check-in was restricted to allow only one check-in per day, and the coaching scripts were adjusted to encourage reflection on wellness status using the personalized anchors.
During the design sessions, the Daily Check-in had separate early warning sign buttons to emphasize the importance of early warning signs ( Figure 2). User feedback indicated these buttons were unnecessary and confusing with the transition to the 9-point rating scale. Thus, the Daily Check-in was simplified by removing these buttons, and early warning signs were clearly defined as +2 and -2 on the wellness rating scale (Table 2). Additionally, the Foundations content and coaching scripts were updated to emphasize the use of the wellness rating scale for early warning signs recognition.
During usability testing, user feedback suggested that exercise and diet were not adequately addressed. Therefore, Foundations and Toolbox content was added to cover the importance of exercise and diet [84][85][86]. User feedback also suggested that finding the right doctor and establishing a therapeutic alliance was not adequately discussed and that the rationale and approach to identifying a hospital in the case of a severe episode were unclear. As a result, the team lesson about working with a psychiatrist was expanded, the rationale for learning about a hospital for inpatient care was clarified, and information about using mental health directives was added.
In their posttask questionnaire responses, users indicated that the app's overall design and organization were straightforward, easy to use and understand, reasonable in terms of time commitment, and met their expectations (Table 3, Multimedia Appendix 5). Users also indicated that both the Foundations and Daily Review were interesting, relevant, and taught them something new.

Pilot Study
The pilot study tested the complete intervention, including the technology and human support. At the F2F session, coaches helped users identify personalized wellness anchors (Table 2) and set mutually agreed-upon target goals (medication adherence, sleep duration, routine bedtime and rise time, and wellness rating range) for daily monitoring (Figure 1). The coaches encouraged users to set goals known to facilitate staying well [11][12][13]87], such as taking their medications 100% of the time, sleeping the recommended amount each day (7-9 hours, with 6-10 hours reasonable for some), going to bed and starting their day within a 1.5-hour window, and keeping their wellness ratings within a balanced range (-1/+1; Table 2).
Users found differentiating between maintaining a regular routine and getting the right amount of sleep confusing. Therefore, a separate button for recording sleep duration was added to the Daily Check-in (Figure 1), and coaching scripts were updated to clarify the behavioral targets and goal setting process (Multimedia Appendix 6). Users also expressed difficulties understanding the Daily Review feedback regarding goal achievement. The first page of Daily Review feedback uses bar graphs to display the percent of days over the last 7 days that the user met their target goal (Figure 3). A title was added to the Daily Review bar graphs to indicate that the percentage bars correspond to goal achievement over the last 7 days. A hover bar feature was also added so that users could view their personalized goals for each behavioral target (Figure 3). Some users found the Daily Review feedback repetitive when target goals were consistently not met. To allow users to sample additional Daily Review content under these conditions, a Review Something Else component was added and made available after completing the suggested Daily Review feedback. Coaches found that users did not always follow up on Daily Review feedback to contact their providers. To address this, when feedback prompting communication with providers was given, a pop-up message with a link to one's psychiatrist's phone number was added to the Daily Review. Email alerts to coaches were also added, and coaching scripts were developed to help the coaches contact the user and psychiatrist under these conditions [63]. At week 4, users were asked to complete reading the Foundation lessons, and coaches assisted users in developing a lifestyle plan to reduce relapse risk (Table 4) and a coping plan for managing signs and symptoms (Table 5). Originally, generic suggestions for the plans were included. However, when coaches asked users to personalize their plans, some wanted to keep the generic plan. Generic plans were removed for the diet, exercise, substances (Attend), stress management (Tranquil), and build-support (Social) sections of the Reduce Risk plan to encourage users to think of relevant personal plans (Multimedia Appendix 7). Users' personalized goals for sleep duration and bedtime/rise time windows, and a generic recommendation to take all of their psychiatric medications daily, were retained. Coaching scripts were adapted to encourage the use of implementation intentions for planning [88][89][90], and users were given examples of implementation intentions in the generic risk-reduction plans (eg, "If you miss medications for more than 3-4 days in a row, then discuss with your psychiatrist").    Users reported confusion and difficulties with setting and achieving target goals and did not consistently follow up with Daily Review recommendations to contact providers; thus, the coach role was expanded from app use support [65] to more active support for self-management and clinical care communication. Clear coach email alerts and dashboard summaries, scripts, and flowsheets were developed to support these additional roles [63]. The coaching scripts were modified to emphasize creating target behavioral goals, assisting users with developing plans, reinforcing success, and making adjustments when goals were not met (Multimedia Appendix 6). This increased self-management support included developing flowsheets and tip sheets to help coaches guide the user to appropriate self-management content [63]. Questions from coaches about how to address worsening symptoms resulted in additional structured protocols to assess suicidality and functional impairment, including clear instructions on when to call for real-time clinical support. Details of the rationale and implementation of the coaching support are described elsewhere [63].

Pilot Study Exit Analysis
When users finished the 8-week pilot study, they were asked to complete a usability questionnaire (Multimedia Appendix 9) [91,92]. Responses are summarized in Table 6 for questions in which ≥7/11 users rated an item as "strongly agree" or "agree," or ≥3/11 users rated an item as "strongly disagree" or "disagree." All users found the Daily Check-in easy to use, and most indicated that it made them more aware of their early warning signs and sleep duration. Users expressed that the Foundations were easy to understand, about the right length, and relevant. They reported that they liked being able to personalize the Wellness Plan and found it relevant for their continued use of the app. Finally, users emphasized the importance of coaching support. They found the coach supportive and the calls convenient in terms of their schedule and appropriate length. Most users indicated that they were motivated by the coach to review intervention content and change their behaviors after coach calls. Some users reported that having self-management resources on their phones was especially convenient when they experienced symptoms. "It's sort of like having a therapist in your phone" (2041).
Users found the Foundation lessons and Wellness Plan relevant and useful. They stated that they liked being able to personalize their wellness anchors and plans and that this process made their app use more meaningful. Users also stated that personalizing their information inspired self-awareness.

Personalizing the information was really helpful, within the Wellness Plan, within triggers . . . It made me so much more aware of myself. (2066)
Moreover, users felt that the coaching support was motivating, useful, and helped them get more out of their app use.
I found the coaching really helpful. . . . [It] was helpful for motivation and for answering questions because the app was confusing at the beginning.
(2061) Users offered many suggestions about changes or additions to data viewing, navigation, personalization, and monitoring, such as adding tracking for energy level, alcohol use, diet, and exercise. "There should be more visual things . . . like video clips" (2063).

The one missing [from the Daily Check-in] is energy level. It's very critical for bipolar. (2008)
Users noted the app's navigation could be complicated, which sometimes led to not using parts of the app; however, coaching support helped resolve navigation difficulties. "Navigating was a little hard to get used to. . . . I'm not sure I ever looked at [the toolbox]" (2041).

It [Navigation] got easier. Like I didn't get at first how you could put things in my toolbox, and I mean [my coach] explained it all to me. (2086)
Users still found that the Daily Review feedback could be repetitive if they were consistently experiencing problems with one specific behavioral target (eg, routine). In some cases, this repetitive feedback led to a discontinuation of use. "I got fed up after a couple weeks 'cause [the Daily Review] was the same thing" (2063).
Some users felt that technical issues impeded their use of the app. Specifically, users experienced problems with the reminders to check in, which contributed to irritation and reduced reliance on the reminders. However, most users felt that the study team was helpful and responsive in resolving technical issues.

Sometimes I can't complete the [Daily Check-in] until
[The] technical things I brought up, [the coach] was like, "That's been a problem we are working on it." It's good to know that it's the phone and not me. (2005) Anchors A thematic analysis of users' mood, thoughts, and wellness rating scale anchors was completed to explore what types of signs and symptoms are relevant for monitoring wellness. The anchors for the mood, thought, and wellness rating scales were coded into subtypes and types (Multimedia Appendix 11). When the field trial anchors were formally coded, only 46% of the mood scale's anchors were coded as "mood," while the remainder were coded as "cognition," "physical," "behavior," or "motivation." For the thought scale, 69% of the anchors were coded as "cognition," with the remainder coded mostly as "mood" and "behavior." In contrast, when users identified personal anchors for the pilot study wellness scale (Table 7), the anchor types were coded as "behavior" (38%), followed by "cognition" (28%), "mood" (17%), "physical," (10%) and "motivation" (7%). In terms of subtypes, anchors for thought content (17%), sleep (12%), thought process (10%), negative mood (10%), energy (9%), and social interactions (8%) accounted for two-thirds of the subtypes.

Discussion
This paper describes the user-centered process that guided the development of the technological and human support components of LiveWell. Consistent with the importance of monitoring [3,11,25,60], the core of the LiveWell intervention consists of a daily self-monitoring tool, the Daily Check-in, which underwent multiple revisions during development. Changes to the technology and the coaching support were also made to help users set clear target goals, track the achievement of those goals, make adjustments, and communicate with care providers.
The initial Daily Check-in included both mood and thought rating scales. Coaches helped users develop personalized anchors for these scales to help users identify early warning signs and symptoms of an episode based on their past experiences. Examining these anchors revealed that the users' anchors often did not fit within the bounds of the requested mood and thought categories. This suggested that users were being asked to personalize scales that did not capture their most relevant wellness variation experiences. Therefore, the mood and thought scales were collapsed into a single wellness rating scale. When users were provided with more freedom to identify personal anchors using the wellness scale, the anchors most commonly reflected behavioral-followed by cognitive, mood, physical, and motivational-signs and symptoms. More specifically, two-thirds of these anchors referenced thought content and process, sleep, negative mood, energy, and social interactions. These findings are consistent with the early warning sign literature indicating that individuals typically endorse changes in cognition (concentration, self-esteem, difficulty with decisions), behavior (more talkative and aggressive, changes in sleep duration), and energy before episodes [93,94].
Additional changes to the Daily Check-in were made to help users distinguish between getting adequate sleep and keeping a regular routine. Users reported that the Daily Check-in made them more aware of early warning signs and symptoms and how much they were sleeping. Early warning sign management and sleep duration are considered to be important targets that underlie the improved outcomes produced by empirically supported therapies for bipolar disorder [3,11,25,60]. It thus appears that user feedback led to changes in the Daily Check-in that may assist users in staying well.
Changes to the technology were also made to clarify goal setting, goal achievement tracking, and making adjustments (Daily Check-in and Daily Review), as users experienced difficulties with these strategies. In addition, changes were made to the Foundations and Toolbox to clarify the process of setting goals, making plans, monitoring, evaluating goal achievement, and making adjustments if needed. Due to the inconsistency with which users would act upon recommendations to contact their provider, pop-up notifications with a link to their psychiatrist's phone number were added.
However, it was unclear that these technology changes were sufficient, so coaching roles were expanded to include support for self-management strategy use and clinical care communication. Research suggests that human support for app use reduces attrition and improves adherence; however, increased engagement does not always translate into improved outcomes [29,38,66,[95][96][97]. Improved outcomes may arise from the inclusion of clinical support to ensure that users identify the content and tools relevant to their needs, use them correctly, and translate this use into their daily lives [38]. This suggests that expanding the coaching roles for LiveWell may improve outcomes. In creating the self-management and clinical care communication support roles for LiveWell, feedback from the coaches played an important role in developing these roles.
Users reported that working with their coaches to tailor their wellness rating scale anchors and plans made the intervention more relevant to their personal experiences. This feedback is consistent with prior studies indicating that personalizing application components to address user needs can increase user engagement and positively impact intervention outcomes [43,98,99]. Thus, the provision of generic plans was minimized to encourage the personalization of the wellness plans. Users noted that developing personally relevant plans motivated them to enact these plans. Taken together, these findings indicate that self-management interventions that utilize open-ended, personalized wellness scales and plans may help individuals develop insight into their health condition and more readily embrace and act on intervention content.
Finally, striking a balance between making the app easy to navigate and fulfilling participant requests for additional features was challenging. As user engagement typically decreases with challenging-to-use applications [100], an effort was made to prioritize user requests related to intervention functionality. Technical issues, such as problems with reminders and battery life, have been addressed with improvements in technology over time, such as the integration of app reminders into the Android operating system and smartphone battery-life improvements.
To support the ongoing improvement and dissemination of technology-based mental health interventions [38][39][40][41][42], we have provided a detailed description of the user-centered development process for LiveWell. This process suggests that individuals with bipolar disorder value target monitoring, personalization of goals and plans, and human support aids as self-management tools. In developing LiveWell's technology and human support, feedback from both users and coaches played an important role, emphasizing the significance of engaging all stakeholders in intervention development. This attention to all-stakeholder input is broadly applicable to developing the technology and the human support for digital mental health interventions.

Conflicts of Interest
DCM has accepted honoraria and consulting fees from Apple Inc, Otsuka Pharmaceuticals, Pear Therapeutics, and the One Mind Foundation; royalties from Oxford Press; and an ownership interest in Adaptive Health Inc. EHG has accepted honoraria from Otsuka Pharmaceuticals. The other authors have no conflicts of interest to declare.

Multimedia Appendix 11
User personalized anchors thematic analysis.