This idea resource booklet (in the format of an illustrated school-year calendar) is designed to be used by teachers in developing programs for preschool children. The developmental and seasonal activities included follow a progression from simple to complex. Suggestions for modifying many of the activities to each child's level of development are given. The activities are cross-indexed under developmental purposes, and are designed to provide a balance between free play and structured guidance, active and quiet experiences, large and small group and individual activities within a flexible schedule. Each activity is described, including the materials needed. Bibliographies of recommended books and records for children and recommended reading for teachers are included. (Author/ED)