A good test is one that successfully identifies a range of relevant competencies when: - The takers are not placed under time pressure - The takers have access to any resources they'd like to use that are generally available to them in life
With regard to certification, this sounds very circular — e.g., "you need standard testing to succeed at standard tests." The question is whether knowledge regurgitation tests are ever the optimal way to determine whether someone is competent, not able to obtain certification.