This is one of the outcomes of the work of the Massachusetts Evaluation Service Center for Occupational Education (ESCOE). Automobile mechanics was selected as a test development area because of the uniqueness of its curriculum, being controlled by the automobile manufacturers through competitive design and redesign of their products. Because of the differences in manufacturer specifications and the fact that the function of the mechanic is to repair or replace, not to create or produce, problems were created which had to be overcome in test development. With this in mind the document briefly discusses test unit materials, a description of the test chassis and optional units, and the test item bank used. Each of these test units on auto mechanics are divided into the following format for teacher use: (1) test item--the task to be done; (2) unit section--piece of test equipment on which the item is to be administered; (3) actual task--describes interactions which are to occur between tester and testee; (4) time--estimate of time required to complete the test task; (5) scoring--detailed criteria to be observed by the classroom teacher; (6) record--description of camera angles from which the completed task should be photographed for central scoring; and (7) record scoring--criteria instructions for the central scorer. (Author/BP)