Abstract
WE AIM HERE to outline a theory of evidence for use. More specifically we lay
foundations for a guide for the use of evidence in predicting policy effectiveness
in situ, a more comprehensive guide than current standard offerings, such
as the Maryland rules in criminology, the weight of evidence scheme of the
International Agency for Research on Cancer (IARC), or the US ‘What
Works Clearinghouse’. The guide itself is meant to be well-grounded but at
the same time to give practicable advice, that is, advice that can be used by
policy-makers not expert in the natural and social sciences, assuming they are
well-intentioned and have a reasonable but limited amount of time and
resources available for searching out evidence and deliberating.