This Ohio Competency Analysis Profile (OCAP), derived from a modified Developing a Curriculum (DACUM) process, is a current comprehensive and verified employer competency program list for diesel mechanics. Each unit (with or without subunits) contains competencies and competency builders that identify the occupational, academic, and employability skills needed to enter this occupational area within that outline are three levels of items: core, advancing, and futuring. Core items are essential to entry-level employment. Advancing items are needed to advance in a given occupation. Futuring items are needed to enter and remain in a given occupation 3 to 4 years from now. This profile contains 17 units: (1) general safety and shop practices; (2) basic mechanical skills; (3) planned maintenance; (4) internal combustion engine operation; (5) gasoline engines; (6) diesel engines; (7) drivetrain; (8) brake systems; (9) suspension and steering; (10) chassis; (11) electrical systems; (12) truck and trailer lighting systems; (13) electronically operated control systems; (14) heating and air conditioning systems; (15) cab and trailer maintenance and repair; (16) record keeping; and (17) employability skills. (NLA)