Abstract
A model for perfect disaggregation is derived which is different from that proposed by Aoki (1978). It is shown that the disaggregation defined is a dual concept of aggregation and can be used to reduce control design. Perfect disaggregation cannot be attained in general. In this case, approximate disaggregation may be obtained as a dual of approximate aggregation using an algorithm recently proposed. The resulting reduced design is suboptimal

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