Modelling human performance reliability in a two stage combined manual and decision task

Based on an experimental study in a two stage combined manual and decision task, a stochastic model for the controllability function of human performance is presented. This measure of human performance is formulated from the random variables which led to the formulation of the reliability and correctability functions. Experimental studies show that the time to committing error follows exponential distribution and the time to error correction follows log normal distribution. Accordingly variation in human performance measures in terms of reliability, correctability and controllability are explained at various levels (3 levels of information load (H) and 3 levels of time lag (TL))of experimental conditions.