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Layered Protocol Analysis of a Control Display Unit
DEFENCE AND CIVIL INST OF ENVIRONMENTALMEDICINE DOWNSVIEW (ONTARIO)
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Layered Protocol Theory LPT has been described as a special case of Perceptual Control Theory PCT where its core tenet is, All communication is the control of belief. It was recognized that LPT could be used to analyse the interaction between communicating partners in the context of human-machine systems. System interface problems were identified for the Control Display Unit CDU in the CH-146 Griffon helicopter. This application presented a good opportunity to conduct a Layered Protocol analysis on the pilot CDU system. Aspects of LPT were discussed in detail including the LPTool, its Network View, GPG View, and Nine Element View. A pilot CDU interaction was modeled with the aid of the LPTool program. The analysis yielded a list of interaction deficiencies between pilot and CDU which supported previous observations. The deficiencies were addressed in a new interface design that would provide the necessary controls and displays so that the required messages could be successfully transmitted and interpreted.
APPROVED FOR PUBLIC RELEASE