THE RELATIVE EFFECTIVENESS OF SIX MEANS OF FURNISHING EDUCATIONAL INFORMATION TO OFF-CAMPUS ELEMENTARY STUDENT TEACHERS WAS INVESTIGATED IN THREE STUDIES. MATERIALS (DEALING, VARIOUSLY, WITH SCHOOL LAW, TESTS, AND MEASUREMENTS, SCHOOL DISCIPLINE, LESSON PLANNING) WERE MAILED TO SUPERVISING TEACHERS OR TO STUDENT TEACHERS DIRECTLY OR TO BOTH. THE STUDENT TEACHERS AND CONTROL STUDENT TEACHERS WHO DID NOT RECEIVE THE MATERIALS WERE TESTED ON KNOWLEDGE OF THE CONTENT COVERED BY THE MATERIALS. WHEN MATERIALS WERE SENT ONLY TO SUPERVISING TEACHERS, NO DIFFERENCES IN CRITERION SCORES RESULTED FROM MANDATORY VERSUS DISCRETIONARY DISTRIBUTION OF THESE MATERIALS TO STUDENT TEACHERS. IN A SECOND STUDY, MAILING MATERIALS TO BOTH SUPERVISING AND STUDENT TEACHERS LED TO SIGNIFICANTLY HIGHER SCORES THAN MAILING ONLY TO STUDENT TEACHERS, WHILE BOTH WERE SIGNIFICANTLY SUPERIOR TO A CONTROL GROUP. IN A THIRD STUDY, MATERIALS MAILED TO STUDENT TEACHERS WAS SUPERIOR TO DEALING WITH THE SAME MATERIAL IN A STUDENT TEACHING SEMINAR, WHILE THE SEMINAR GROUP WAS NOT SUPERIOR TO A CONTROL GROUP. IT WAS CONCLUDED THAT DIRECT TRANSMISSION OF INFORMATION TO OFF-CAMPUS STUDENT TEACHERS IS MORE EFFECTIVE THAN OTHER MODES OF TRANSMITTING RELEVANT INFORMATION. THE ROLE OF THE SUPERVISING TEACHER, INFORMATION TRANSMISSION, AND STUDENT-TEACHER DIFFICULTIES ARE ALSO DISCUSSED. THIS ARTICLE WAS PUBLISHED IN "BULLETIN OF THE SCHOOL OF EDUCATION, INDIANA UNIVERSITY," VOLUME 42, NUMBER 6, NOVEMBER 1966, AND IS AVAILABLE FROM THE INDIANA UNIVERSITY BOOKSTORE, BLOOMINGTON, INDIANA 47401, FOR $1.25. (LC)