As direction and inspiration towards the development of such theory or tools, Newell posits that one way to approach sufficiency is by modelling human cognition in computational layers or bands.
He suggests that these computational layers emerge from the natural hierarchy of information processing. The lowest layers comprising the biological band perform the most primitive tasks in a machine-efficient way. The next level up, the cognitive band, is postulated as the first strong layer and the first layer predominated by symbols. This can be taken to be the symbol layer. Many of the architectures studied in this set of documents operate at the symbol level in order to provide information processing in the rational band.
The place where analytical tools could most benefit AI is in the analysis of necessary and sufficient support for capabilities. Also needed is a method of decomposition which could bound or define the capabilities necessary to support general intelligence.
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