THIS IS A GUIDE FOR SCHOOL LIGHTING, DESIGNED FOR EDUCATORS AS WELL AS ARCHITECTS. IT MAKES USE OF RECENT RESEARCH, NOTABLY THE BLACKWELL REPORT ON EVALUATION OF VISUAL TASKS. THE GUIDE BEGINS WITH AN OVERVIEW OF CHANGING GOALS AND NEEDS OF SCHOOL LIGHTING, AND A TABULATION OF COMMON CLASSROOM VISUAL TASKS THAT REQUIRE VARIATIONS IN LIGHTING. VISIBILITY VARIABLES ARE DISCUSSED, SUCH AS SIZE, CONTRAST, REFLECTANCE, GLARE, AND QUALITY OF ILLUMINATION. THE CHARACTERISTICS, ADVANTAGES, AND METHODS OF USING ELECTRIC LIGHTING AND DAYLIGHTING ARE DESCRIBED, FOLLOWED BY A DISCUSSION OF ILLUMINATION MAINTENANCE AND DESIGN PROCEDURE. THE GUIDE CONCLUDES WITH SPECIAL APPLICATIONS OF THESE PRINCIPLES, USING EXAMPLES RANGING FROM ART ROOMS TO SWIMMING POOLS. APPENDICES LIST THE BLACKWELL EXPERIMENTS, THE SCISSORS CURVE GRAPH, INSTRUMENTS USED IN THE LIGHTING SURVEY, AND DEFINITIONS OF TERMS. THIS DOCUMENT IS A REPRINT FROM "ILLUMINATING ENGINEERING," APRIL, 1962, AND IS AVAILABLE FROM THE ILLUMINATING ENGINEERING SOCIETY, 345 EAST 47TH STREET, NEW YORK, N.Y. (JO)