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The purpose of this paper has been to present and exemplify a new and alternate method of return assessment. The method does have computational and mathematical advantage. It is also believed to have analytic advantage in that it is less susceptible to manipulation by base selection and more closely associated with performance measures which are relatively well defined. [ABSTRACT FROM AUTHOR]

By means of a number of general models the relationships are analysed which are of importance when applying shiftwork systems : for the organization which applies them, its employees, the owners and the community. A quantitative model gives an insight into the shiftwork system which can be regarded as an optimum from an economic angle (depending on the pay level, shift allowances and invested capital). Divergences from the optimum may decrease the rate of return considerably. The outcomes of an analysis of alternatives in a series of companies are discussed. The approach on the side of companies frequently proves not to be satisfactory. It appears that better information is desirable, with regard to both the economic and the social aspects of shiftwork. [ABSTRACT FROM AUTHOR]