Types of Evidence
Evidence for academic evaluations is usually of two types: concrete detail and analytic detail. Analytic detail comes from critical thinking about abstract elements of the thing being evaluated. It will also include quotations from experts. Concrete detail comes from sense perceptions and measurements--facts about color, speed, size, texture, smell, taste, and so on. Concrete details are more likely to support concrete criteria (as opposed to abstract criteria) used in judging objects. Analytic detail will more often support abstract criteria (as opposed to concrete criteria), like the criterion "feasibility," discussed in the section on criteria. Analytic detail also appears most often in academic evaluations of solutions to problems, although such solutions can also sometimes be evaluated according to concrete criteria.