A group decision support system is required on a value-based decision because there are different concern caused by differing preferences, experiences, and background. It is to enable each decision-maker to evaluate and rank the solution alternatives before engaging into negotiation with other decision-makers. Stakeholder of multi-criteria decision making problems usually evaluates the alternative solution from different perspective, making it possible to have a dominant solution among the alternatives. Each stakeholder needs to identify the goals that can be optimized and those that can be compromised in order to reach an agreement with other stakeholders. This paper presents group decision model involving three decision-makers on the selection of suitable system for a building's roof. The objective of the research is to find an agreement options model and coalition algorithms for multi person decision with two main preferences of value which are function and cost. The methodology combines value analysis method using Function Analysis System Technique (FAST); Life Cycle Cost analysis, group decision analysis method based on Analytical Hierarchy Process (AHP) in a satisfying options, and Game theory-based agent system to develop agreement option and coalition formation for the support system. The support system bridges theoretical gap between automated design in construction domain and automated negotiation in information technology domain by providing a structured methodology which can lead to systematic support system and automated negotiation. It will contribute to value management body of knowledge as an advanced method for creativity and analysis phase, since the practice of this knowledge is teamwork based. In the case of roof system selection, it reveals the start of the first negotiation round. Some of the solutions are not an option because no individual stakeholder or coalition of stakeholders desires to select it. The result indicates the alternative solution that will be the best-fit solution. In this problem, a space frame system is the 'best-fit' solution for the roof system.
Keywordssupport system, value-based, group decision and negotiation, roof system
AbstrakSistem pendukung keputusan kelompok sangat diperlukan dalam proses pengambilan keputusan berbasis nilai, sebagaimana karakteristik keilmuan Manajemen Nilai yang didasarkan pada kelompok kerja multi disiplin. Karenanya ada perbedaan pertimbangan bagi setiap pengambil keputusan sebagai akibat dari perbedaan preferensi, pengalaman, dan latar belakang. Pada sistem tersebut sangat dimungkinkan setiap pengambil keputusan untuk mengevaluasi solusi alternatif sebelum terlibat dalam negosiasi dengan pengambil keputusan yang lain. Evaluasi alternatif pada pengambilan keputusan dengan multi-kriteria biasanya dari perspektif yang berbeda, tanpa adanya solusi yang dominan diantara pengambil keputusan. Sehubungan kepentingan untuk mendapatkan persetujuan dari pengambil keputusan yang lain, setiap pengambil keputusan perlu untuk mengidentifikasi...