Transcription Errors in Coded Maintenance Related Information.
Final rept. Feb-Jun 69,
AEROSPACE MEDICAL RESEARCH LAB WRIGHT-PATTERSON AFB OHIO
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Work Unit Codes WUC are used throughout the military services to identify the items upon which maintenance is performed. The effect of code length 5 vs. 7 characters and of code manual format alphabetical order vs. standard order of item descriptions upon code identification and transcription time and errors was investigated experimentally. After a moderate degree of task proficiency had been developed, the effect of time pressure upon performance was investigated. Discrete categories of errors were established, and different rates of development for the associated discrimination processes were identified. Though alphabetical arrangement of item descriptors was judged by subjects to have a significant facilitative effect upon performance, this effect diminished with training, and even reversed under the highest level of time pressure. The addition of two characters to existing 5-character codes caused only a small increase in errors and time. The errors, however, doubled under time pressure conditions. Author
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