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The Twenty Subsystems

Subsystems Which Process Material-Energy

Input Stage

Ingestor: brings material-energy into the system

Throughput Stage

Distributor: distributes material-energy for use throughout the system

Converter: converts material-energy into suitable form for use by system

Producer: synthesizes material-energy for use within the system

M-E Storage: stores material-energy used by the system

Motor: handles mobility of various parts of the system

Supporter: provides physical support to the system

Output Stage

Extruder: handles material-energy discharged by the system

Subsystems Which Process Information

Input Stage

Input Transducer: brings information into the system

Throughput Stage

Internal Transducer: recieves and converts information brought into the system

Channel & Net: distributes information throughout the system

Decoder: prepares information for use by the system

Timer: maintains the appropriate spatial/temporal relationships

Associator: maintains appropriate relationships between information sources

Memory: stores information for system use

Decider: makes decisions about various system operations

Encoder: converts information to needed usable form

Output Stage

Transducer: handles information output of system

Subsystems Which Process Material-Energy & Information

Throughput Stage

Reproducer: carries on reproductive function

Function Boundary: protects system from outside influences

Reference: "The Living Systems Theory of James Grier Miller" by Elaine Parent