MIDAlpha TitleTitleYearColor/BWRunning TimeFormatsAbstractTopics
644CONSERVATIONCONSERVATION1967color29 min16mm/vhs (Piaget's Developmental Theory series) Children between the ages of five and twelve are presented in individual interviews with tasks using the standard procedures developed in Geneva, Switzerland. The tasks involve conservation of quality, length, area and volume. The characteristics of thought from preoperational to formal are identified. Tests are given and analyzed by Drs. Robert Karplus and Celia Stendler.