Investigates the effectiveness of on-the-job training (OJT). Presents a definition of OJT used for this research project which involved two studies: the first in the call centres of a large company, and the second in post offices. Gives the results of the study which indicate the OJT programs were only partially successful in realising training goals. Indicates that self-efficacy, prior experience with tasks, managerial support and workload were the most powerful predictors for training effectiveness. Concludes that the evidence suggests that OJT is not entirely an effective training method although more research is needed in this area.