The social scientist is now applying his knowledge and skills in various fields. But in the American trade-union movement he faces unusual problems. His challenges are essentially those of determining how to serve, and how to implant a belief in the value of his findings and reports. There is no widespread acceptance of the conclusion that he can make a real contribution. He is still not considered necessary or likely to be useful in the routine operation of the union or in the development of its policy and tactics. Progress has been made during the last few years in securing his admission to the staff of unions. But much pioneering work has still to be done to obtain frank acknowledgment of his potential usefulness and free acceptance of his experimental, inquiring and critical approaches.