Measuring fidelity of implementation can help educators understand if an intervention is working as intended.

We summarize research on the relationship between fidelity of implementation and student reading outcomes.

When tracking teachers’ fidelity during implementation of a literacy intervention, both use of the intervention components and quality of intervention delivery should be measured, keeping an eye out for both global and lesson-specific components.

Effective implementation of a literacy initiative that includes interventions calls on teachers to do so as intended, with high fidelity.