The primary outcome of any information feedback system must be data for the classroom teacher. For this reason, a system's value has to be measured in terms of its usefulness to the teacher in making instructional decisions. A report should contain only data that the teacher needs and should be produced in an understandable format. User feedback should be solicited to modify the report design. Adequate time should be allowed in the first production run for debugging. Once the system is perfected, arrangements may be made with the data processing operations personnel to institute an automatic procedure which will prepare the input, run the job, and distribute the output. However, it is desirable to have someone familiar with the output to examine it for quirks before distribution. Some of the current productions of the Office of Research and Evaluation of the School District of Philadelphia provide examples of useful teacher reports. One report, for the diagnosis of pupil performance, lists each pupil's answer to each test item, showing at a glance the student's strengths and weaknesses on a given test or subject. (Author/SL)