From an informal group of a dozen faculty and graduate students at Temple University, the Jean Piaget Society grew in seven years to 500 members who have interests in the application of genetic epistemology to their own disciplines and professions. At the outset Piaget endorsed the concept of a society which bore his name and presented a major address on equilibration at the society's first symposium in May, 1971. Had he not done so the society would no doubt have remained a small parochial group, like so many others throughout the country, interested in Piaget and his theory. With the encouragement of Genevans and the leadership of its first four presidents, Lois Macomber, Barbara Press­ eisen, Marilyn Appel, and John Mickelson, the society undertook a number of programs to collect and disseminate the results of scholarly work in genetic epistemology. Particular emphasis was placed upon applications of Piaget's theory to developmental psychology, philos­ ophy, and education. One of these programs was the publication of an annual series on the development of knowing, of which this volume is the first. In 1973, the society asked Hans Furth with the assistance of Willis Overton and Jeanette Gallagher to initiate and plan a series of yearbooks with the result that in addition to this volume, a second volume on education was commissioned, and a third one on the decalage issue was planned.