Table 1. Development process of theory-informed communication materials.

Step	Activity	Output
Step 1: formative research
Theoretical foundations	Aligned theoretical foundations for communication materials with overall multilevel intervention aims.	Theoretical basis established for communication materials.
Focus groups	Conducted focus groups with the priority population.	Summarized findings to tailor communication content.
Step 2: behavior change objectives	Conducted a literature review to identify and select PA parenting behaviors aligned with existing evidence and theoretical basis.	Parenting objectives are formed to advance children’s PAa.
Step 3: theory-informed strategy	Identified theoretical determinants of parental behavior change and outlined the application of determinants.	A strategy created to address PA parenting objectives.
Step 4: operationalization	Selected communication channels and drafted, reviewed, and edited materials to operationalize the theory-informed strategy.	Communication materials finalized.

^aPA: physical activity.