The main aim of the research: to offer analysis methods for development of a knowledge-based decision support system in the sphere of construction export. • To evaluate the effectiveness of construction export using methods of multiple criteria analysis. • To make use of expert methods when developing the system of feasibility study of construction export and the knowledge base of best experience. • To describe application of internet as a tool in analysis of foreign markets and provide offers to exporters of the Lithuanian construction branch on how to use Internet in their activities thus granting improvement of export effectiveness. • To provide offers on how to reduce export cost and improve effectiveness and quality by using the newest IT and knowledge systems.

Research object is arranging maintenance process of the buildings of the housing estate of the city. During the research there was analyzed the efficiency of the activity of the subjects of building maintenance, macro- and micro-environmental factors, affecting building maintenance, criteria, influencing the quality of the activity of building maintenance, interest groups of the maintenance process, their objectives and possibilities to achieve them. The research aims are establishing a complex model of multi-criteria analysis of building maintenance, embracing real estate, analysis of the factors, affecting the efficiency of real estate maintenance, of the subjects, utilizing and holding the property, and of their objectives.