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Companies which are business customers also notice that a prerequisite for good cooperation with suppliers is providing them with quality of product and management systems specifications. The criteria which may determine temporary evaluation of a supplier include: the level of technical quality which is offered, advantageous price conditions, deliveries meeting deadlines, favourable payment deadlines, having a quality system, the level of assistance, responding to complaints. Many companies also assess suppliers on the basis of their level of management focusing on their system of certificates (ISO 9001, ISO 14001). The results of research indicated that companies building relations with suppliers most frequently employ a supplier opinion survey, clear products’ specifications, implementation of quality management system ISO 9001, periodical coefficients of the suppliers’ opinion, auditing suppliers, trainings for suppliers, informative services available from websites and team-building meetings as well as implementation of environmental manage- ment system (EMS) conform to ISO 14001. Observing world trends, one may notice easily that recently suppliers have been monitored from the point of view of meeting the sustainable development requirements following economic aspects (demanding high technical quality, delivery reliability, price competitiveness, technical support), more and more often also environ- mental aspects and social aspects.