What is an evidence hierarchy?
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Evidence hierarchy: What is it?

An evidence hierarchy classifies evidence in terms of its ability to detect effectiveness

Although a large body of research exists in the field of education, it is not all useful for every purpose and it is important to distinguish research that provides a strong indication of the direct impact of a program from research that is less able to do. Research that is more useful in determining effectiveness emphasises the ability to show that results were a direct outcome of the program being evaluated. When the evidence provides stronger indications of outcomes, there can be greater confidence that replicating the program will lead to similar outcomes.

Evidence is classified into three categories