Absrraeb This paper describes the application of two multiobjective optimisation techniques to the high efficiency deep grinding process. The process is modelled using P fuzzy expert system. This allows understanding gained through theoretical analysis to be combined with empirical data in B mlitaly model. The objective is to simultaneously minimise the surface temperature and specific grinding energy. A problem constraint is represented within the fuzzy model. It forms BII objective representing the degree o f infeasibility of the solution.