The object of the research: the process of forming partner relationship; the purpose of work: improvement of theoretical and methodical support of forming partner relationships and suggesting practical recommendations for the development of machine-building enterprise effective relationships with partners; methods and apparatus: comparative, economic, systemic and structural analysis; method of expert evaluations, taxonomic indicator of development; Markov chains; theoretical and practical results: the process of selecting potential partners of the enterprise, the difference of which is evaluation of professional competence of partners taking into account manufacturing, marketing, financial, technical-technological, organizational, informational, socio-psychological components that are combined into an integral indicator of evaluating potential partner, constructed by the method of taxonomic indicator of development; methodical approach to determining the effectiveness of partner relationships, which means the calculation of generalized indicator of efficiency of relationship; difference of approach is in the consideration of both economic and socio-psychological components of effectiveness; procedure of forecasting the effectiveness of development partner relationships, its peculiarity is the use of probabilities of possible states of development of relationships based on Markov chains; definition of "partner relationship" as a form of long-term, mutually beneficial relationships of market business actors, based on voluntariness and equality of the actors to implement economic interest of partners, the difference of when actors is the expansion of the business relations, taking into account the essential characteristics and principles partnership; classification of partner relationship of enterprises through the allocation of theoretically grounded and practically important characteristics such as duration of operation of the partnership and clarifying types of relationships on the basis of features: the participants of partnership, goals of forming partnerships and market coverage; structure and content of the information system of formation and development of relations of enterprise with partners who take into account the specifics of machine-building, including the nature of investment and the need to implement constant innovations, and, unlike existing ones are oriented at adapting to changes and allow to integrate modules of several classes of information systems; Subject and level of implementation: developments are implemented in practical work of PC «Electromachyna», LTD «BAK «SAI», in the educational process in SKKhNUE; The sphere of application: forming and development of partner of relationships machine-building enterprises, educational process.