A procedure for assessing intervention fidelity in experiments testing educational and behavioral interventions

Area of Science:

• Health Services Research
• Clinical Trials Methodology
• Program Evaluation

Background:

• Intervention effectiveness is typically assessed via randomized experiments.
• A gap often exists between the designed intervention and its actual implementation.
• This discrepancy complicates the interpretation of study results, attributing outcomes to the intervention model or implementation fidelity.

Purpose of the Study:

• To present a systematic, five-step procedure for assessing intervention fidelity in randomized controlled trials (RCTs).
• To highlight the advantages of this structured approach to fidelity assessment.
• To provide practical examples of applying the procedure in RCTs.

Main Methods:

• Elaboration of a five-step procedure for systematic intervention fidelity assessment.
• Focus on application within the context of randomized controlled trials (RCTs).
• Inclusion of illustrative examples for practical guidance.

Main Results:

• A clear, structured methodology for evaluating how well an intervention was implemented.
• Demonstration of how fidelity data can be integrated into outcome analysis.
• Practical insights into applying the fidelity assessment procedure.

Conclusions:

• Accurate assessment of intervention fidelity is vital for validly interpreting study outcomes.
• The proposed five-step procedure offers a systematic approach to enhance the rigor of RCTs.
• Incorporating fidelity data strengthens the evidence base for intervention effectiveness.