The proceedings of the University Affiliated Program's Second Special Interdisciplinary Seminar, concerning Piagetian theory, are presented. The opening session dealt with the question "Can Piaget's Theory Provide a Better Psychometry?", C. E. Meyers, speaker. Among the papers reprinted in the proceedings from the afternoon program of Piagetian symposia, papers, test demonstrations and films are: (1) "Cognitive Development in Nursery School as Measured by a Battery of Piagetian Tasks" M. Lennan Nye; (2) "Keywords and Piagetian Concepts: A Suggestion" Jeannette Veatch; (3) "Piagetian Theory Related to Science and Math Curriculum Development" Richard Kimball (abstract); (4) "The Development of Subjective Responsibility: Differential Aspects" Betty Henry; (5) "A Child's Cognitive Conquest of Space and Time" Henry W. Maier; (6) "Cognitive Controls in Children and Performance on Piagetian Conservative Tasks" J. Roland Fleck (abstract); (7) "The Development of Young Cerebral Palsied Children According to Piaget's Sensorimotor Theory" F. Annette Tessier; (8) "Application of Piagetian Theory to the Development of the Concept of Space in Visually Limited Children" Rose-Marie Swallow and Marie K. Poulsen; (9) Application of Piagetian Theory to Exceptional Children" M. Patricia Simmons; (10) "Review of Recent Research Relating to . . . Volume Conservation During Adolescence" Marcia Maguire. (KM)