Key question 1: To what extent is the change identified a result of the policy/measure?
- Compare the results with the control group, if feasible.
- Carry out qualitative contribution analysis.
The effectiveness study on the Dutch measure Medical Advice for Sick-reported Students (MASS) used a quasi-experimental design. 7 out of 21 schools for pre-vocational secondary education had been applying the intervention programme, and were all asked to participate in the study (intervention schools). Within the group of remaining schools, seven were asked to participate in the study as control schools. Control schools were selected by their characteristics to match as much as possible those of intervention schools in terms of urbanisation, fields of education, and size of the school.
Key question 2: What would have happened anyway in absence of the policy/measure?
Links to relevant sections of the toolkit
Would you like to read more about how to verify attribution?
Go to section ‘Assessing whether our programme or policy makes a difference’