The purpose of this symposium was to make clear what problems were pointed out from a standpoint of educational practices in schools and how we could clarify the problems from a viewpoint of psychology in oder to teach arts and crafts of present days. Y. Kawatoko referred to the developmental stages of drawing by kellog, and presented general principles that we should teach expressive acts as sign by a rule of wide application. H.Oogida showed some clinical examples of diagnosis according to Mclee's "Drawing-Completion-Test". N. Ide showed mainly practical examples of relationship between space cognition of infants and teaching them expression. G. Suzuki showed practical examples of relationship between space cognition of school children and teaching them expression. These examples show concretely that in teaching arts the space cognition of children develops through learning rules of expression on their works.