Table 2.

Key process evaluation concepts

Feasibility	The extent to which an intervention can be delivered or carried out within a given setting
Delivery
Fidelity	The extent to which the intervention activities are delivered by the intervention providers as planned and are true to the ‘spirit of the intervention’
Dose delivered	The amount of each intervention activity delivered by the intervention providers
Adaption	Changes made by intervention providers to the original intervention activity during implementation
Acceptability
Reach	The proportion of intended intervention recipients participating in each intervention activity
Participant responsiveness	How the intervention providers and recipients interact and are satisfied with the intervention activities
Context	Aspects of the physical, social, and economic environment that may influence delivery and acceptance of the intervention
Implementation	A composite score indicating the extent to which the intervention has been implemented and received by the intervention providers and recipients