A STUDY WAS CONDUCTED TO INVESTIGATE THE EFFECT OF DIFFERENT CLASSROOM ENVIRONMENTS UPON STUDENT PARTICIPATION AND INTERRELATIONSHIPS. AN EXPERIMENTAL CLASS IN INTRODUCTORY PSYCHOLOGY WAS FORMED WITH AN ENROLLMENT OF 144 STUDENTS. THE DIFFERENCE BETWEEN THE EXPERIMENTAL CLASS AND OTHER CLASSES WAS THAT THE ROOM SELECTION HAD BEEN PREARRANGED ACCORDING TO CERTAIN EXPERIMENTAL REQUIREMENTS. PARTICIPATION WAS RELATED TO SUBAREAS IN EACH ROOM. RATING SCALES WERE USED TO LEARN THE REACTIONS OF THE STUDENTS TO THE ROOMS AND TO THE DISCUSSION SECTIONS. IT WAS CONCLUDED THAT PEOPLE WILL ENDEAVOR TO ESCAPE A POOR CLASSROOM ENVIRONMENT WHEN POSSIBLE. UNDER THE EXPERIMENTAL CONDITIONS MORE PARTICIPATION WAS FOUND IN DISCUSSIONS IN THE LABORATORY WITH ITS STRAIGHT ROW ARRANGEMENT OF CHAIRS THAN IN THE SEMINAR ROOM. SEATING POSITION WITHIN THE CLASSROOM ALSO MADE A DIFFERENCE IN PARTICIPATION. (RS)