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The paper describes a systems approach to overal process design and the developemnt of control strategies for raw materials preparation plants in which a number of chemical quality constraints must be simultaneously met. The dynamic performance characteristics of mills, hoppers, fluidised silos, stockpiles and transportation elements are examined in relation to randomly varying quality typical of mined or quarried materials. Design criteria and means of achieving design objectives using computer simulation are discussed. Dynamic overall computer-aided quality control with respect to quality reference algorithms is considered and it is emphased that plant controllability can be very much influenced at the design stage. Previous published work is reviewed and an overall aim is to give sound practical guidance to the process design engineer.