Chapter 6 118 Several intervention features have been implemented to address the target group’s needs during the waiting period. The application uses a calendar-based train journey metaphor to symbolize the patient’s progression toward the start of cardiac rehabilitation (CR) (Figure 2, 2.1). This progression occurs automatically over time, aiming to provide a sense of certainty during the waiting period. The app delivers a total of 43 multimedia messages, defaulting to three per day, with the frequency adjusting based on the patient’s specified CR start date. Patients can choose from three message types: introductory videos from healthcare providers like a physiotherapist, dietitian, and psychologist to inform and connect with the CR team (Figure 2, 2.3); audio narratives from former patients to offer emotional support and hope (Figure 2, 2.4); and actionable advice promoting healthy activities and improving understanding of their condition and the rehabilitation process (Figure 2, 2.5). Table 6.1 Intervention features that address adherence and acceptance, linked to principles from the IeG, BCT and PSD framework, and features that address patient needs as identified in our prior study. Features addressing adherence and acceptance # Feature IeG* recommendation BCT** PSD*** Principle 1.1 Limited number of daily messages Realistic, achievable goals, align with life situation Graded tasks Reduction 1.2 Playful interface Positive approach Liking 1.3 Simple interface Simplicity Reduction 1.4 Done pile tracker Short-term goals, apply gamification Self-monitoring /Feedback Self-monitoring 1.5 Bag upgrade Reward for adherence, apply gamification Non-specific reward Rewards 1.6 Use of multimedia and simple language Simplify communication Tailoring 1.7 Tone-of-voice Positive approach 1.8 Notification Send reminders Reminders 1.9 Support page Offer technical support Features addressing patient needs # Feature Needs 2.1 Calendar-based progression Certainty during waiting period, pre-CR guidance 2.2 Information provided by healthcare provider Certainty during waiting period, pre-CR guidance 2.3 Video introductions Certainty during waiting period, CR expectancy 2.4 Spoken peer stories Certainty during waiting period, managing emotions, future recovery 2.5 Textual advice Physical activity confidence, Health status understanding *Inclusive eHealth Guide (IeG) (Faber & Al-Dhahir et al., 2023), **Behaviour Change Technique (BCT) taxonomy (Su & Yu, 2019), and ***Persuasive System Design (PSD) model (Oinas-Kukkonen & Harjumaa, 2009)
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