The purpose of this paper is to provide information to help decide whether Feuerstein's "Instrumental Enrichment" (FIE) technique (or some variation of it) might be useful in teaching leadership-relevant thinking skills to prospective Army leaders. This paper examines some 35 reports of FIE research conducted in Israel, Venezuela, Canada, and in a number of locations in the United States, and asks what can be concluded from these reports with respect to the following: (1) the nature and reliability of FIE effects; and (2) for those effects that appear to be statistically reliable, the "amount" of FIE that appears to be required in order for these effects to appear. Results of this review suggest that the following characterize those studies that tend to show experimental/comparison-group differences: (1) at least a week of FIE training for instructors; (2) generally 80 or more hours of student exposure to FIE; and (3) FIE taught in conjunction with subject matter. Observed effects have been shown on nonverbal measures of intelligence. Statistically significant differences have been observed in a number of populations. There is enough evidence suggesting that FIE improves thinking skills to encourage researchers to continue investigating it. An appendix describes Feuerstein's theory and method. (Seven pages of references are included.) (LMO)