The paper explores the complex history of quality and quantity from Aristotle’s doctrine of categories up to current discussions of the status of qualia in the mind-body problem in modern analytic philosophy. In the first part of the paper we trace the progressive mechanisation,...

Qualitative researchers often use other principles for judging the quality of their study than quantitative researchers. This inhibits a straightforward assessment of the quality and comparability of different types of studies, as well as decision-making about their usefulness for further...