SDT-TAM-FSS Framework

TAM-related constructs are not measured with dedicated validated instruments, so the trial cannot formally test the underlying theoretical mechanism. The SOUND programme is built on a sequential causal chain integrating Family Social Support theory, the Technology Acceptance Model, and Self-Determination Theory. Self-Determination Theory distinguishes controlled motivation, driven by external pressure, from autonomous motivation, driven by genuine personal valuation. The three TAM constructs targeted in the SOUND intervention are perceived ease of use, perceived compatibility, and perceived observability. Family support mediated through TAM perceptions is hypothesised to promote identification regulation and integration regulation, converting external prompts into durable internal motivation.