A control system contains multiple levels, each with an appropriate level of resolution, defined by the architects. Higher levels generate behaviors with broader scopes, longer time span, and fewer details. Higher levels also perceive objects, situations, and other spatial aspects with higher levels of abstraction.

2. Multiple Functionality Generic Node

A generic model applies to all control nodes in the systems. Integrated situation perception, behavior generation, value judgement, and knowledge modeling and updating are the common functionality of all the nodes.

3. Multiple Abstraction Layers

4D/RCS covers a full spectrum of life cycle phases, providing:

	A conceptual framework for intelligent systems.
	A reference model for system components, interfaces, knowledge base, and mechanisms for perception and learning.
	Methods and tools for engineering the sytems.
	Systems operations and human interface.

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Date Created: 6/6/2002
Last Updated: 5/122003