Multivalued fuzzy sets in cost/time estimation of flat plate processing

Cost/time estimation in flat plate processing (FPP) is a complex system of man-work-environment-organisation. As the share and impact of physical, psy chological, personal, and other characteristics of humans (non-process fact ors) in this complex system becomes larger, the state of FPP time estimatio n changes from well-defined to ill-defined (uncertain). In this paper, the effect of process and non-process factors on the activity time variation ar e discussed and a multivalued fuzzy set (MVFS) is used to model the uncerta inty activity time/cost estimation in FPP. Emphasis is placed on modelling of nonrandom uncertainties using fuzzy sets.