Table 3.

Excerpt of mapping intervention functions to COM-B and Theoretical Domains Framework (TDF) components.

COM-B	Theoretical Domains Framework (TDF)	Sub-themes	Intervention funtions	Example
Psychological capability	Skills (cognitive)	Parents have difficulty in measuring food portions	Training, Environmental restructuring	Train parents to measure portion sizes, provide a visual tool to help measure food
Reflective motivation	Beliefs about capabilities	Parents have a lack of confidence in their ability to make changes	Education, persuasion, Enablement	Educate, persuade and enable parents to increase their self-confidence in making changes to their children’s eating habits.
Physical opportunity	Environmental context and resources	Parents’ preferences for household objects such as plates to measure portion sizes	Environmental restructuring	Restructure the home environment to provide a tool for greater accuracy in measuring food portions