## 5 Results and Iterative Feature Refinement
### Implementation of Feedback: Feature Refinement
#### 5.3.3 Enhanced Session Closure Scenarios  
Originally, the system included only one closure scenario involving the character going to sleep. Experts identified this as a design limitation, observing that exclusive reliance on a single bedtime metaphor may reduce symbolic resonance and hinder flexible adaptation across diverse developmental profiles. Informed by these insights, the system was expanded to include a diverse array of closure scenarios that reflect children's real-world routines and developmental needs.  
First, to better connect screen time with offline life, new scenarios based on common daily routines were added. Experts recommended integrating culturally and developmentally familiar rituals to enhance emotional coherence. As a result, transitions such as \"eating,\" \"brushing teeth,\" or \"using the toilet\" were implemented, framing screen time as a natural part of the child's day rather than an isolated event.  
To address this, a brief cognitive game was introduced immediately before the closure prompt, functioning as a soft bridge to redirect attention and help internalise routine. This not only served as a transition aid, but also functioned as a form of developmentally appropriate scaffolding, particularly for children with attentional challenges. By offering brief, success-oriented tasks--such as sequencing games or simple drawing--the system provides a structured pathway to support smooth and emotionally secure disengagement.  
Second, to foster continuity of experience and motivation for what comes next, the system supports voluntary transitions into desirable non-screen activities. Informed by Social Learning Theory, the character models its own voluntary transition to a non-screen activity (e.g., \"I'm going to read a book now\"), which is followed by a gentle prompt inviting the child to plan their own next step (e.g., \"What are you going to do now, [PERSON]?\"). This interaction is intentionally designed to support the child's autonomy, consistent with Self-Determination Theory, by encouraging self-directed planning rather than simply following a suggestion.  
Finally, this diversified closure architecture--offering multiple symbolic endings with varied cognitive and emotional profiles--operationalizes the core theoretical tenets of this study. It respects autonomy (SDT), leverages symbolic play [63], and embeds committed action within an emotionally attuned narrative (ACT), thereby fostering an autonomy-supportive environment that facilitates emotionally secure disengagement. This expanded closure architecture is visually summarised in Figure 5, which contrasts the original single-scenario design with the diversified options introduced post-consultation--spanning daily routines, voluntary activities, and symbolic mini-games. This redesign enhances developmental alignment and emotional coherence.  
Figure 5: Comparison of session closure scenarios before and after expert consultation. (**a**) Original design with a single bedtime-themed closure; (**b**) Expanded design featuring diversified transitions based on daily routines, voluntary non-screen activities, and symbolic play.