Table 1

An example of a typology of evidence (example refers to social interventions in children) (adapted from Muir Gray24)

Research questionQualitative researchSurveyCase-control studiesCohort studiesRCTsQuasi-experimental studiesNon experimental evaluationsSystematic reviews
Does this work? Does doing this work better than doing that?+++++++
Process of service delivery
How does it work?+++++++
Does it matter?+++++++
Will it do more good than harm?++++++++++
Will children/parents be willing to or want to take up the service offered?+++++++++
Cost effectiveness
Is it worth buying this service?+++++
Is this the right service for these children?++++++
Satisfaction with the service
Are users, providers, and other stakeholders satisfied with the service?+++++++