ONE OF A SERIES OF NINE SCHOOL PLANT PLANNING GUIDES, THIS REPORT OUTLINES SPECIFIC AS WELL AS GENERAL PLANNING PRINCIPLES. A PHILOSOPHICAL BASIS OF PLANNING IS RELATED TO THE EDUCATIONAL NEEDS OF THE SECONDARY SCHOOL STUDENT. PLANNING PROCEDURES INCLUDE LONG RANGE PLANNING AND STEPS FOR OVERALL PLANNING. INCLUDED IN THE STEPS ARE PREPARING EDUCATIONAL SPECIFICATIONS, SELECTING A SITE, DEVELOPING PRELIMINARY AND FINAL PLANS, AND APPROVING FINAL DOCUMENTS. SPACE AND SPACE ORGANIZATION PROBLEMS INVOLVE SIZE, KIND, RELATIONSHIP, FLEXIBILITY, AND SAFETY OF PLANT AND SITE AREAS. SOME SPECIAL PROBLEMS CONSIDERED ARE THERMAL, VISUAL, AND AUDITORY ENVIRONMENTS, PLUMBING FACILITIES, MAINTENANCE, AND DECORATION. KINDS OF SPACES AND THE SPECIAL REQUIREMENTS OF EACH KIND RECEIVE MUCH INDIVIDUAL ATTENTION IN THE FINAL CHAPTER. A BIBLIOGRAPHY OF RELATED MATERIALS IS INCLUDED AT THE END OF THE REPORT. (RH)