Concepts and Systems: Definitions

Clarify defintition of:

there are many

System:
Defined by having a boundary
Inputs and outputs (across boundary)
Made up of sub systems
Possesses requisite variety

there are a number of systems taxonomies
(arbitary? foucault)

A
Natural Systems
MAn made Physical Systems
Man Made Abstract Systems - (Concepts)
Human Activity Systen

Concept:  man made abstract system