The history of the Educational Testing Service (ETS) Factor Kits is summarized. The original ETS Factor Kit was developed in 1954 and contained 51 items, three each for each of 15 factors and six for a 16th factor. The next edition was developed in 1963 and included adaptations (clones) of the defining tests instead of the exact copies. These tests marked 24 factors. The current edition of the ETS Factor Kit was developed in 1976 and consists of 72 tests marking 23 cognitive factors. Some limitations of paper-and-pencil versions of the kits are identified, and computer-administered versions being developed are described. Information is given about a study comparing computer and paper-and-pencil tests. The Factor Kit tests were intended to be used as markers in factor-analytic studies of cognition and have been widely used in psychological research. Tests that could be used to determine a number of major factors were assembled in "kits" for factorial research. Limitations of the format restricted the kinds of cognitive processes that could be assessed and the ways in which tests could be scored. Questions of test misuse arose. Creating computer-administered versions posed a number of problems in the areas of timing, confirmation and correction of responses, and pacing. For the computer administered versions, system features are described. A small pilot study compared the two formats using data for 30 secondary school students aged 13 to 19 years, who took part of each kit of 10 tests in each format. Results suggest that the factors measured by these 10 tests were not affected by the use of the computer version. Versions of the computer-administered kit for field testing are anticipated in 1992. Three tables provide details about the 1954, 1963, and 1976 editions of the Factor Kits. A 17-item list of references is included. (SLD)