Revised Evidence Guidelines for the CAYT Database of Impact Studies [2015]

We have revised the CAYT ‘level of evidence’ grades for scoring impact studies. The new guidelines are available below.


When selecting prevention programmes for young people, policy makers, practitioners and health and education professionals need easy access to reliable and independently validated information. It is therefore necessary to clearly establish “what works,” as well as what counts as good evidence. That means drafting well-defined standards in order to classify the levels of evidence-based research.

A well supported evidence-based intervention programme is usually comprised of two components: a strong magnitude of impact, along with a fair and rigorous methodological approach (Nation et al., 2003). In other words, there has to be causal relationship between implementation of the programme and outcomes of the intervention.



Click here to access the evidence guidelines for CAYT impact studies.

CAYT new guidelines


Click here to submit your programme to the CAYT team for inclusion in the database >>