The document comprises the final evaluation report and the fourth quarterly progress report of Operation Breakthrough, an experimental demonstration project to upgrade Spanish-speaking workers in entry-level factory jobs. Ten classes at six sites with a total of 133 students were held; 53 attended at least 50 of the total 150 hours. Classes were conducted either prior to or after working hours, although part of the class time overlapped with company time; the companies' support of the program thus involved both teacher and worker compensation. Low attendance rate was a consistent problem, but attendance figures rose the second year, due to the companies' involvement in planning, financing, and monitoring the classes. Three sets of classes operated according to the intentions of the proposal and were found to have few operational problems while three other of the organizations' operations lacked what had been identified as essential elements. Classroom aides (company personnel) were used during the first year, but rarely during the second. They were viewed as important by teachers and administrators, allowing class flexibility and providing a resource for job-related English instruction. Conversational English was deemed important to the students. The document reports the results of interviews, monitoring visits, and test instruments. A program guide is being developed. (Author/AJ)