The use of formative evaluation in a new set of materials for French language instruction is discussed. The materials, entitled "In the French Body," use videodisk technology to teach both verbal and nonverbal aspects of communication. The technical and pedagogical design of the materials are described, difficulties of using controlled formative evaluation in situations where previously untaught skills (in this case, nonverbal communication) are taught are examined, and the particular advantages offered by this technology in performing controlled formative evaluation are outlined. The evolution of the idea on which the instructional and evaluation methods are based and the process of developing the materials are also chronicled in some detail. Inspiration and techniques were derived from the work of Laurence Wylie on communication within the French culture. Some conclusions are drawn about the lessons learned and the cyclical nature of the curriculum development process, and ongoing activities of the project are noted. (MSE)