The paper describes a current research project now being conducted by the Experimental Manpower Laboratory at Mobilization for Youth (MFY-EML) in New York City. The overall objective of the MFY-EML is to develop and test new methods of teaching vocational skills to hard-to-employ youth. The MFY-EML is involved in developing a program to teach behavioral principles to trainers. One of the most important reasons for investigating the behavioral approach to training problems is its central reliance on measurable and observable behaviors, rather than on inner emotional factors. The paper describes and illustrates the scope of the MFY-EML's empirical investigation to find out, aside from hunches or intuition, how effective the behavioral approach really is in its type of training situations. (Author)