This perspective on how testing and evaluation data are used and could be used for school improvement is based partly on the experience of the Austin (Texas) Public Schools and partly on their goals. Four conditions are necessary for the effective use of evaluation information: (1) real need; (2) trust in the evaluators and in the information provided; (3) understanding of the information; and (4) practice in using such information. In considering the use of testing and evaluation information, the level of preparation of the data and the ultimate use of the information must be determined. Examples of evaluation information as used are appended, including a discussion of the "Report on School Effectiveness" of the Austin Independent School District, three school profiles on context variables related to general outcome variables, and an outline of effective school standards. It is concluded that, as the trend for summarization of evaluation information continues, the user must not lose sight of the details necessary in dealing with complex information. (SLD)