Intended for persons establishing job development programs for developmentally disabled individuals, this training manual details the structure and procedures of Project PLANTWORK, a 21-month demonstration program which placed approximately 70 workers with developmental disabilities into employment in horticulture industry firms or into horticulture-related jobs. It is noted that much of the project's success resulted from reducing the perceived risks of employers that these workers will increase overall labor costs. Among the proven approaches detailed in the manual are: adoption of the Projects With Industry (PWI) partnership between the business community and the rehabilitation community; utilization of wage subsidies and supplements for on-the-job training; provision of a personnel assistance program of screening and placement services; and networking with human service referral agencies. Sections discuss: general employment problems of workers with disabilities; the need to place workers with disabilities into employment; the conceptual framework of the PWI marketing, and Horticulture Hiring the Disabled (HHD) models; the horticultural industry; the job development process; Project PLANTWORK (including project population, new approaches, and goals); placement documentation; wage subsidies as a marketing tool; and project findings and developments. Appendices present an organizational chart and list of area offices, an annotated bibliography, and project placement forms. (CB)