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Explore the basic principles of systems theory, from defining systems to understanding components and boundaries. Learn about inputs, outputs, processes, control issues, and the role of the observer's perspective in studying systems.
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IS 460 Notes Fundamentals of General Systems Theory by Thomas Hilton
Why Study Systems • Understanding • Influence
What is a System? • Definition: A system is a set of interacting components that operate within a boundary to achieve some purpose. • Postulate: Everything is a system.
Parts of a System • Output • Input • Processes • Boundary • Environment Output Process C Output Process D Process B Input Process A Input Process E
Two Types Of Output • Intended (purpose of the system) • Unintended (byproducts) • Control Issues? (Ashby’s Law) Output Output
Two Types of Input • Main (transformed) • Maintenance (consumed) Input Input
Three Types Of Processes • Transformation • Interface • Input • Output • Control • Output Sensor • Feedback Loop • Input Regulator Process C Process B Process D Process A Process E
Boundary • The boundary is where the system ends and the environment begins. • Boundary identification is critical to your professional survival • Boundary Identification is often complicated by its intangible nature.
Environment • The Environment is everything outside the system. • The environment is infinite, so we commonly discuss only the “relevant” environment. • The relevant environment is objects that affect the behavior of the system but are beyond its control.
RelationshipsBetween Systems • Hierarchical • System • Super-system • Subsystem • Linear • All input comes from some system • All output goes to some system • “Closed” systems don’t exist.
Question… • Is everything we know about a system?
Understanding Systems • Identify the parts and their relationships. • Use the black box concept to concentrate on inputs and outputs. • Use the closed system concept to concentrate on processes (remember closed systems don't really exist).
The Role of Observer Perspective • System definition depends on perspective. • System behavior is affected by observation. • System existence can depend on observation.