A GOTO Book Club interview with Dennis Hansen, author of 'Model-Based Systems Engineering and Requirements Definition,' covering his 60+ year career in systems engineering. The discussion walks through the book's structure using a layered onion analogy for system definition, the document development flow from mission to subsystem specs, and the use of SysML and UML across different engineering levels. Key themes include the importance of iterative modeling, integrating NIST SP 800-53 security requirements early, transitioning between DODAF and SysML views, and maintaining models for long-term sustainment. Hansen emphasizes collaboration across systems, software, and security engineers and the value of upfront requirements definition to avoid costly changes during acceptance testing.
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