Table 2.

Steps to message content development.

Step	Summary of step
STEP 1: Context of the intervention	The formative research provides an in-depth analysis of the context of the intervention.
STEP 2: Break down intended outcomes	Related to the formative research and the overall outcomes of the project, specific outcomes for the five areas of focus, i.e. care-seeking, diet, physical activity, smoking and stress, were identified.
STEP 3: Identify and list the enablers and barriers to behaviour change	Enablers to promoting a healthy lifestyle and barriers to implementing a healthy lifestyle were identified from the formative research and listed.
STEP 4: Categorise the barriers and enablers according to COM-B and the TDF	The identified enablers and barriers were categorised according to TDF and COM-B.
STEP 5: Suggest behaviour change approaches for each enabler and barrier	In light of the appropriate transtheoretical domains, behaviour change approaches were identified for each enabler and barrier
STEP 6: Table of message content produced based on the intended outcomes, barriers and enablers and BCTs	A table of message was produced based on the intended outcomes and assigned BCTs addressing each enabler and barrier.