In systems engineering, the tricotyledon theory of system design (T3SD) is a mathematical theory of system design developed by A. Wayne Wymore. T3SD consists of a language for describing systems and requirements, which is based on set theory, a mathematical systems model based on port automata, and a precise definition of the different types of system requirements and relationships between requirements.
System requirements model I/O requirement Performance requirement System test requirement Cost requirement Tradeoff requirement
System design Based on set theory Transition systems Functional system design Buildable system design
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