This digest describes some of the basic logic-of-evaluation skills and some of the basic methodological skills that need to be mastered in order to practice the art and science of evaluation. Some topics from the logic of evaluation that must be dealt with include understanding : (1) the differences and connections between evaluation and other kinds of research; (2) the differences among the basic evaluative procedures and differences between basic evaluation predicates; (3) the arguments that purported to establish the impossibility of scientific demonstrations of evaluations and why these arguments failed; (4) the difference between holistic evaluation and three types of analytic evaluation; (5) the distinction between formative and summative evaluation; (6) the nature of needs assessment; (7) the logic of checklists; (8) the differences and connections between objectivity and bias, preference, commitment, and expertise; (9) the range of evaluation approaches; (10) the difference between the kind of evidence required to establish causation and that required to demonstrate culpability; (11) how evaluation developed to a discipline and a transdiscipline; and (12) how evaluation theory developed to its present form. Nine methodological skills of great importance to evaluation are also listed. (SLD)