Engineer/constructor firms responsible for large process plant engineering, including the human-plant interface, have an emerging need for in-house human factors engineering (HFE) expertise. Stone & Webster Engineering Corporation has met his need through the creation of an HFE group. The group was founded as a small, informal, multidisciplinary organization. In an experimental manner, the group was provided the freedom to define its HFE markets within the firm and the process and power industry. Organizational design and management factors related to the functions and effectiveness of the group are discussed.