The author previously published a paper discussing how to conduct an analysis based on a cluster sample. In that paper, the author outlined several widely adopted alternative approaches, and pointed out that such approaches are anyway not needed for population figures, and not possible for non-probability samples. Thus, the author queried the…

When governments and pressure groups attend only to research that suits their political purposes, it makes a mockery of the idea of evidence-informed policy and practice. In this article, the author cites examples of research that picked up weak and misleading evidence for political purposes. The author argues that researchers are tied in to the…

This article started as a debate between the two authors. Both authors present a series of propositions about quality standards in education research. Cook's propositions, as might be expected, not only concern the importance of experimental trials for establishing the security of causal evidence, but also include some important practical and…