Three aspects of instruction in English for Special Purposes (ESP) in the workplace are discussed with emphasis on the partnership between the ESL teacher, the employer and supervisors, and the worker with a limited knowledge of English. First, a plan for defining needs is outlined, which involves discussion of numbers and types of students, ways to group them, scheduling, location of the course, financing, and materials. The needs analysis also involves: (1) observing the work-site; (2) conversing with workers, noting language functions, various methods of assessing English language levels, and reading and writing skills; and (3) establishing a profile of ways in which English serves the learner/worker on the job. The second area discussed is program design, that is, a step-by-step process for setting up the program, defining the objectives and working out activities and approaches to evaluation. The final section outlines the steps taken to develop one successful ESP course and describes methods and materials in the course as it progressed. (AMH)