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Data recording in a research environment often results in the recording of much redundant data due to the unpredictable nature of most experiments. Data measuring instruments often malfunction, making their data invalid. Data processing efficiency can be increased if the experimental engineer can make judgments at editing time which control the processing and eliminate much of the redundant data and provide substitutions for the invalid data. A small digital computer, coupled with a digital display, light pen, and typewriter, has been programmed to provide an editing station for the experimenter to evaluate his data for processing.