2. Define the retrospective and prospective research designs. What are the advantages and disadvantages of these designs?

21.根據Barlow等(2017),APA所提出的 the Scicntist-Practitione Model of Clinical Psychologist需包含下列哪些角色元素? a) carrier of science； b) consumer of science； c) creator of science； d) evaluator of science； e) manager of science； f) messenger of science