This research review contains summary and synthesis of 360 references selected from over 900 in 1) Education Index, 2) Psychological Abstracts, and 3) some 40 reviews and bibliographies, 28 of which were selected for inclusion in the 392-item bibliography at the end of this review. Principal findings of the cited quantitative research studies are summarized in the introductory section. Concluding implications for further research, presented as a guide in Air Force technical training research projects, are also expected to assist other investigators in the field. The description of research studies and tabular material are presented chronologically (1900-1952) under each topic heading. Topics under the major heading of "Criteria for Instructor Effectiveness" are rating the effectiveness of instructors, administrator rating, peer rating, student rating, self-rating, objective observation of performance, and student change as a measure. Topics under "The Predictors--Traits and Qualities Assumed to be Related to Instructor Effectiveness" are intelligence, education, scholarship, age and experience, knowledge of subject matter and present professional information and teacher examination scores, extracurricular activities and general culture test scores, socioeconomic status and sex and marital status, teaching aptitude and attitude toward teaching and interest, voice and speech characteristics, photograph, statistical analyses of abilities, personality studies and tests. (JS)