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)

The interaction style of a pupil depends on his personality, motivational and cognitive traits, his location in the classroom and the similarity of his personality to that of the teacher.'' Combinations of personal traits and teacher attention can determine pupils' academic and social success. (Author/AL)

Predictions from Anderson's theories of structured communication were tested in grade eitht biology classes. Students given verbal instruction with a high degree of structure performed better on acquisition tests than students receiving less structured lessons. (AL)

Examined student behaviors during laboratory activities and the amount of time involved in each behavior. Approximately 89 percent of the student time was spent interacting with others. The amount of time spent on various activities appeared to be dependent on the nature of the activity and on the make up of the laboratory group. (YP)