In response to the proliferation of computer processing in military systems, the Air Force Operational Test and Evaluation Center (AFOTEC) has developed the Software Usability Evaluator, or SUE. SUE is a software tool for the generation, administration, and analysis of questionnaires that assess software usability in operational systems. To date, SUE has proven to be a powerful source of descriptive and narrative information on software interface deficiencies and potential means of remediation.