Generation of Human Views with Monterey Phoenix
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This research advances model-based systems engineering approaches and tools for representing human behaviors in terms of decision-making processes and choices, and integrating human models with technological system models to predict and purge unintended interactions. In particular, the Monterey Phoenix (MP) system architecture and workflow behavior modeling approach and tool, created at NPS with CRUSER sponsorship, was extended and used to produce a case study of an area clearance system composed of humans and technology. Innoslate, a commercial system architecting tool, was also used to test the integration of models of human behavior into system architecture models. Both tools generated scenarios of possible human-system interactions, but each model had distinct features. The Innoslate model enabled activity probabilities (for failure analysis) and durations (for mission completion time) to be assigned for Monte Carlo simulation of a subset of all possible scenarios, whereas MP provided exhaustive generation of all possible scenarios up to a specified scope. Analysis of the latter model exposed some unanticipated interactions, including one significant finding of a vulnerability that could arise from an improper human-system interaction. A NAVAIR-sponsored requirements verification and validation approach was subsequently developed from this and other case studies that exposed unwanted, hazardous, incorrect and otherwise undesirable behaviors in system designs. Future work will assess integration potential of the MCSC-sponsored Framework for Assessing Cost and Technology (FACT) tool with MP and Innoslate so that tradespace analysis questions typically asked at the physical architecture level can be informed directly by higher level behavior models and lifecycle requirements.
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