This guide is a result of two years' piloting and revising the Science Curriculum Improvement Study (SCIS) program for the students of Guam. The life science portions of SCIS were chosen and adapted for the ecology of the area. Program flexibility is stressed and outdoor activities are encouraged. Used in grade one, the topic of organisms is divided into six parts, including seeds and plants, classroom aquaria, habitats, algae, food web, and detritus. Each part is then organized into 16 chapters or learning activities. These activities emphasize the SCIS philosophy of student exploration, invention, and discovery. Included in each investigation is information on teaching materials, preparations, and optional activities. At the end of the guide is an appendix with learning activities especially adapted to the ecology of Guam, and a glossary of terms. (MA)