Glass (1977) identifies six techniques for determining the criterion score or point in criterion-referenced assessment: (i) the performance of others, (ii) counting backwards from 100%, (iii) bootstrapping on other criterion scores, (iv) judging minimal competence, (v) decision-theoretic approaches, (vi) operations research methods [ 3]. He argues that educational movements in the USA like accountability, mastery learning, competency-based education and the like rest on the common notion that a minimal acceptable level of performance on a task can be specified.