Figure 1
From: The dynamic sustainability framework: addressing the paradox of sustainment amid ongoing change
Program drift and voltage drop. Illustrating the concepts of 'program drift,’ in which the expected effect of an intervention is presumed to decrease over time as practitioners adapt the delivery of the intervention (A), and 'voltage drop,’ in which the effect of an intervention is presumed to decrease as testing moves from Efficacy to Effectiveness to Dissemination and Implementation (D&I) research stages (B).