Decision making for value-based design in Value Management (VM) is very complicated due to the involvement of many parties. In such situation where the designer, project manager, facility manager and others are involved in choosing a single alternative from a set of solutions, a negotiation support is required to evaluate and rank the solution before engaging into negotiation. This paper presents a conceptual model of negotiation support for VM. It consists of developing the appropriate research approach, methodology of negotiation and agent-based negotiation in VM. The research objectives are to find a theoretical basis and research approach for negotiation support methodology on VM, to develop a decision model for technical solution options in a satisfying function/cost preferences, to investigate negotiation style and outcome and analyze the correlation between them for the basis of scenarios on the agent system, to develop a model for agreement options and coalition algorithms on value-based decision, to validate the coalition algorithms and introduce an initial model of Negotiation Support for Value Management (NSVM). A triangulation methodology has been used to fulfill the objectives. It combines simultaneous triangulation by using case studies and survey methods and sequential triangulation in which results of one method are essential in planning the next method (theoretical mapping, survey research, focus group, case study and conceptual modeling). The methodology is based on a theoretical approach which consists of value-based decision nature in construction VM, multicriteria group decision making, game theory, negotiation theory, and agent-based development. This 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), and Game theory-based agent system to develop a negotiation support. The negotiation support 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 for VM process. It will contribute to the Value Management body of knowledge as an advanced method for creativity and analysis phase, since the practice of this knowledge is teamwork based.

Building design is developed into complexities, especially because of the emergence needs on applying a concept of sustainability. Aesthetic and engineering systems are no longer as main consideration in a design production process. Collaboration is needed to facilitate the integration of multiple knowledge and participants in a design process. In the process, multiple experts are required for achieving the best design. This paper purposes to discover issues and solutions as the important factors of collaborative design. Literature study is applied to determine the factors which are physical, technical, and social factors. They are found as three main aspects to be considered in supporting successful collaborative design. It is also found that recently, research in this area is directing for developing social factors as main issue. Factor analysis is also used as methodology to identify and analyze the similarities and interdependencies between factors. Analysis of data which is gained from designers and experts in Indonesia discovers that the three factors are reduced into two factors. The model of successful collaborative design is developed based on two findings in this research, that is not only conceptually but also empirically.

The complexity of the design and completion of buildings poses a challenge for the construction industry in terms of meeting user needs. Performance-based building design (PBBD) is a design concept that describes these needs as performance requirements, designing buildings according to an iterative process of translating and evaluating the performance requirements of the buildings. PBBD is a concept that is used to produce buildings with high performance. This study aims to identify which PBBD factors are applied by architect and engineers in the planning and design of high-rise residential building in Surabaya, Indonesia. Primary data were collected by a survey using observation. A questionnaire was distributed to designers who were involved in design processes. A total of 68 respondents responded to the questionnaire. A descriptive analysis through a scatter plot was used to rank the application of PBBD. Factor analysis was used for the application of the PBBD concept. Four factors were identified: the interests of occupants, building management, process of design collaboration and risk of loss. Future research is needed to measure the success model of PBBD and to integrate PBBD into BIM (building information modeling) to allow interoperability.

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Building’s design is developing to involve complexities of engineering systems, where design process requires various disciplines of participants to solve the complex issues. Collaborative design is developed with main purpose to facilitate the integration of multiple participants in design process to produce best design. This paper presents conceptual understanding, current practices, and theoretical framework of collaborative design. Literature review builds the conceptual understanding, exploratory study through in-depth interviews to design managers and designers reveals the current practices, and grounded theory constructs the theoretical framework. The review had found three main indicators of collaborative design, and through those indicators it has been identified that collaborative design is implemented at design process. The interviews had revealed that best design is hard to be achieved although collaborative design has been applied. Through grounded theory analysis, it has been found that the lack understanding of Knowledge Management (KM) roles is found to be main issue collaborative design practices.