Reports results of a study of biology classes in Israel that includes describing transactions in a representative sample of biology classes (N=22) in the year 1973, comparing transactions in recitation with those of laboratory lessons, and studying the effects of subject matter on the classroom transaction. (CS)

Activities in 31 Israeli high school biology and 4 college-level laboratories in first and second years of medical school were analyzed using the Classroom Observation Instruments. Percentages of time spent in pre-lab discussion (problem identification, instructions); lab-work (identifying investigation components, responding to students,…