This article draws on three assessment paradigms -- psychometrics, outcomes-based and curriculum-based assessment -- to discuss paradigmatic changes in senior school assessment and achievement standard-setting in Queensland, Australia, over the last 50 years. These include radical reforms in 1970 from university-controlled examinations to school-based assessments applying normative standard-setting, to subsequent reforms in 1978 introducing competence(curriculum)-based assessment and standards. From 2019, a new reform introduces a combination of school-based and external assessment with procedures for establishing standards still in progress. Changes to Queensland assessment and standard-setting are discussed in terms of three preconditions for paradigm change -- dissatisfaction, an alternative acceptable paradigm, and majority acceptance of change. Influence of paradigmatic origins of reformers is discussed. The amalgam of curriculum-based assessment and psychometric paradigms in the new Queensland system is considered in terms of theoretical compatibility and potential impact on the new standards.