Table 3.

Overview of process evaluation data collection

Component and definition	Data source	Arm	Data collection method	Specific dataa	Timing
Implementation
Fidelity Quality of what is delivered	Professionals and other stakeholders (e.g. interventionists, managers)	IG	Semi-structured (group) interviews	– a.o. experienced benefits, burden, usefulness of ‘Stay Active at Home’; involvement with intervention	At the end of the implementation phase
	Older adults	IG, CG	Telephone interviews	– a.o. satisfaction with home care and awareness of behavioural change in professionals	6 months after baseline (with data for effect and economic evaluation)
	Researchers	IG	Project logbook	– Performance according to protocol	Continuously throughout the implementation phase
Dose Quantity of what is delivered	Professionals	IG	Registration forms and checklists	– Number of professionals: attending programme meetings; making practical assignments; reading weekly newsletters	Continuously throughout the implementation phase
	Older adults	IG	Client records	– a.o. hours of care; staff turn-over trained professionals; formulation and implementation of goal-setting and action planning	At the end of the implementation phase
Adaptations Alterations made to the intervention	Researchers	IG	Project logbook	– if applicable: changes in content, procedures, activities and processes	Continuously throughout the implementation phase
Reach Extent to which the target group was reached	Professionals	IG	Project logbook	– Number of professionals who will refuse, drop out or complet the programme and reasons for refusal and drop-out	Continuously throughout the implementation phase
	Older adults	IG	Project logbook	– Number of older adults who will refuse, drop out or complete the programme and reasons for refusal and drop-out	Continuously throughout the implementation phase
Mechanisms of impact
Mechanisms that are expected to produce change	Professionals	IG, CG	Self-report questionnaire	– Knowledge test and self-efficacy and outcome expectation questionnaire inspired by the work of Resnick et al. [75–77] – Additional evaluation questions (which cover the different topics of the programme)	6 and 12 months after baseline
	Older adults	IG, CG	Self-report questionnaire	– Self-efficacy and outcome expectation questionnaire inspired by the work of Resnick et al. [78]	6 and 12 months after baseline (with data for effect and economic evaluation)
Contextual factors
Factors that may influence the implementation/ outcomes of the intervention	Professionals and other stakeholders (e.g. interventionists, managers)	IG	Semi-structured (group) interviews	– a.o. facilitators and barriers in applying ‘Stay Active at Home’ in practice	At the end of the implementation phase
	Researchers	IG	Project logbook	– a.o. facilitators and barriers in applying ‘Stay Active at Home’	Continuously throughout the implementation phase

IG intervention group, CG control group

^aNeed to be further specified