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This paper presents an integrated system in which a knowledge-based decision support system (DSS) for selecting planning and design (P&D) tenders in public building construction. The Analytic Hierarchy Process (AHP) method is used to determine the weightings for evaluation criteria among decision makers and Fuzzy Multiple Criteria Decision Making (FMCDM) is dealt with the subjectivity and vagueness in the tender selection process. A case study consisting of nine alternatives, solicited from a public works agency in Taiwan, illustrates the effectiveness of the proposed approach and developed system.