IDEAS FOR SCIENCE INVESTIGATIONS FOR SECONDARY SCHOOL STUDENTS ARE DESCRIBED. IN PART I THE STUDENT IS INTRODUCED TO THE IDEA OF THE PROJECT-TYPE INVESTIGATION AND IS GIVEN A GENERAL OVERVIEW OF THE MANUAL. A SECTION WHICH IS WRITTEN FOR THE TEACHER INCLUDES A DISCUSSION OF (1) EDUCATIONAL VALUES DERIVED FROM INDIVIDUAL INVESTIGATIONS, AND (2) THE ROLE OF THE TEACHER IN INVESTIGATIVE ACTIVITIES. IN PART II THE PHENOMENON OF SAP RISE IN PLANTS IS USED TO ILLUSTRATE PROBLEMS FOR INVESTIGATION. THE APPROACHES TO RELATED PROBLEMS TAKEN BY THREE STUDENTS ARE USED TO DEMONSTRATE APPROACHES TO EXPERIMENTAL WORK. INFORMATION ON PROCEDURES INVOLVED IN REPORTING THE RESULTS OF AN INVESTIGATION IS ALSO INCLUDED IN THIS SECTION. PART III CONTAINS IDEAS FOR POSSIBLE INVESTIGATION IN THE AREAS OF BIOLOGY, CHEMISTRY, AND PHYSICS. ITEMS INCLUDED GENERALLY CONTAIN SOME BACKGROUND INFORMATION AND A SERIES OF QUESTIONS. AN ANNOTATED BIBLIOGRAPHY, SUBDIVIDED INTO IDEAS, TECHNIQUES, AND INFORMATION IN DEPTH COMPRISES PART IV. THIS DOCUMENT IS AVAILABLE FOR $2.25 FROM THE NATIONAL SCIENCE TEACHERS ASSOCIATION, 1201 SIXTEENTH STREET, N.W., WASHINGTON, D.C. 20036. (AG)