This curriculum guide, updated from the Iowa 1973 version, is geared to vocational and technical agriculture instructors, to meet their needs in planning and conducting instructional programs for their students. Students completing instruction in agricultural supplies and services should have (1) explored the field of agricultural supplies and services occupations and made tentative career choices; and (2) developed attitudes, competencies, and job skills needed for successful job entry or employment in these fields. The guide is organized into seven units, covering the following subjects: opportunities in agricultural supplies and services, human relations, sales, business records and procedures, organization and operation of agricultural businesses, product knowledge of agricultural supplies, and laws and regulations affecting agricultural businesses. The units are organized around a problem-solving approach to lesson planning. Each unit is divided into a series of problems, and each problem area features study questions, reference materials, interest approach, learning activities, conclusion, evaluation criteria, and optional learning activities. Keys, information sheets, and transparency masters are included for use in conducting the learning activities suggested. A list of occupational titles and tips on evaluating progress in the course also are included in the publication. (KC)