The pattern of correct and incorrect responses on the Slosson Intelligence Test (SIT) can be used by teachers to estimate the student's strengths and weaknesses. A scheme for classifying the items was developed to aid teachers and other professionals interested in conducting an informal item analysis with the SIT so it could be added to other diagnostic information. The eight categories for items on the SIT include: (1) arithmetic; (2) vocabulary; (3) numerical memory; (4) word memory; (5) comparison; (6) general knowledge; (7) motor skills; and (8) similarities and/or analogies. An example of how to implement the informal item analysis is provided. The goal of the informal item analysis will be achieved if it helps provide teachers with additional diagnostic insights so that instruction can be more responsive to students' needs. (Three tables of data are included.) (RS)