On the mechanisms of intervention effect fade-out

What is it about?

The study examines fade-out of intervention effects. That is, while interventions often have sizable effects when measured at the end of the interventions, the effects often diminish at later occasions and sometimes disappear completely. Fade-out has been thoroughly documented but the reasons why it happens - the mechanisms - are not fully understood. This study provides an overview of potential mechanisms of fade-out of intervention effects, and tests hypotheses connected to the mechanisms using a sample of school interventions.

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Why is it important?

Knowledge about fade-out mechanisms is important because some mechanisms are compatible with lasting effects on children’s skills, while others are not. Therefore, such knowledge is necessary for cost-effectiveness and cost-benefit analyses. These analyses should determine how many resources to allocate to interventions and how educational policymakers should prioritize among existing interventions. Furthermore, because different mechanisms align with different theories of skill development, learning more about fade-out may help researchers choose among theories and develop new ones. In turn, this may lead to the development of more effective interventions.