These performance tests for the area of transportation/automotive mechanics consist of a sampling technique (domain referenced tests) which covers all the possible performance situations. When used in total, they may also serve as a comprehensive test. Introductory materials discuss domain referenced testing, determining the domains, and developing performance testing situations. For each domain an item form sheet is provided which is a list of rules for developing a domain referenced test (DRT). It includes a domain statement describing the behavior and content of the domain; instructions, giving directions on how to determine an appropriate testing situation; customer cues, giving customer complaints and a stratified listing of elements keyed to each complaint; content limits, including facets and elements of a potential test and identifying the allowable content of a DRT; and evaluation--a score card consisting of performance indicators with standard and minimum scores assigned. These domains are covered: (1) heating and cooling systems, (2) fuel system, (3) body electrical system, (4) braking system, (5) engine system, (6) power train system, (7) starting and charging systems, (8) ignition system, (9) suspension and steering systems, (10) emissions control system. (DRTs for theory and task-detailing booklet are available separately as CE 027 747 and CE 027 745.) (YLB)