Abstract
Experiments were conducted to review the existing describing function models on human behaviour for single channel tasks. Random appearing stationary forcing functions and disturbances were present and it was assumed that the operator established stationary during all the tests. The results of the analyzed data indicated that a linear model with random time varying coefficients provided a good description of the operators' behaviour. Studies were conducted to determine what modifications to the single variable model system are necessary for a good representation of multivariable manual control systems. The Experiments show that a sample data system with random sample intervals seems to be necessary. This model becomes complicated. Therefore, the application of the concept of information-theory has been tried to assess the performance of the human operator in multi-loop tasks. It was learnt that with the knowledge of the internal dynamics of the operator, there is some hope to determine performance indices for manual control systems with the methods of the information-theory
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