Table 1

Key terms and definitions used in the ADAPT study

Adaptation	Intentional modification(s) of an evidence-informed intervention, in order to achieve better fit between an intervention and a new context.
Context	Any feature of the circumstances in which an intervention is implemented that may interact with the intervention to produce variation in outcomes.^{9 10}
Core components	Those features in the intent and design of an intervention deemed responsible for the effectiveness of the intervention.²
Drift	A misapplication or a mistaken application of an intervention involving technical errors, abandonment of core components or introduction of counterproductive elements resulting in a loss of intervention benefits.¹¹
Refinement	Modification(s) of an intervention to work in the same place or with the same population as originally designed and implemented.
Replication	The process of re-implementing an established intervention in a new context in a way that maintains fidelity to core goals, activities, delivery techniques, intensity and duration of the original study.¹²
Scale-out	The deliberate use of strategies to implement, test, improve and sustain an intervention as it is delivered to new populations and/or through new delivery systems that differ from those in effectiveness trials.¹³
Scale-up	The deliberate effort to broaden the delivery of an evidence-based intervention with the intention of reaching larger numbers of a target audience.¹³