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IntroductionWithin both industrial and military/aerospace environments, the systemsdevelopment process has increasingly involved decisions as to what the human should do and what should be done by machines. Fifty years ago, most tasks were manual, some involved mechanical assistance (mechanised), and relatively few could be referred to as totally automated. Since that time there has been an increasing emphasis on utilising the improved capabilities of machines to assist and/or replace humans. In general, as technology has increased the capability of machines, functions that were previously performed by humans have been transferred to machines. This is often the result of a decision process that simply asks whether the machine is capable of performing the task, rather than whether the machine can perform the task better (e.g. more costeffectively) than a human. The objective of the work reported was to investigate the current methods of allocating functions to humans and/or machines and to propose methods that can improve the effectiveness of that process.Both research and development efforts have been performed during the last half-century on man-machine interfaces and function allocation in the design of military and aerospace systems [1][2][3][4][5]. There has also been work in the context of air traffic control[6,7] and nuclear power-plant operations [8]. The obvious catalyst for much of the increase in machine capability has been provided by the increased capabilities of computers. The advances in sensors, processing capability, and control systems have significantly changed the basic use of humans in modern systems. In many systems today, humans are extensively involved in what has been referred to as supervisory control, which is the activity involved in initiating, monitoring, and adjusting processes that are otherwise automatically controlled [9].This research was concerned with the role of humans in manufacturing operations. Within the last ten years there has been an explosion of interest, illustrated in both the popular and the technical literature, on the use of robotics in manufacturing operations. Part of this attention has resulted from the relative trade positions of th...