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Abstrak :
In order to increase the quality of Project implementation much research will need to be carried out in Indonesia and abroad. In 1960 the Government of UK identified many construction projects that were not able to increase the communication and coordination between the design and construction phase. The concept of build ability arose in 1979 in order to enhance the design process by inputting the construction method during the design phase. The Construction Industry Research Information Association (CIRIA) has defined build ability as follows: "the extent to which the design of a building facilitates ease of construction, subject to overall requirements for the completed building?. Project (CICE) researched into the increasing of quality, efficiency, productivity and cost effectiveness in the construction projects. The research estimates that constructability improvements saved at least 10-20 times the cost of the constructability effort. The Construction Industry Institute, Austin, USA in 1986 defined constructability as ?the optimum use of construction knowledge and experience in planning, engineering, procurement and field operations to achieve overall project objectives?. The research, which is a partial requirement for a Master degree in construction management at the University of Indonesia, was aimed at understanding the coordinating position and influence of the owner of projects for improving constructability during conceptual planning phase. The research proceeded to study into the impact of owner contribution for improving constructability during conceptual planning phase. In order to further understand such owner contribution, its impact on project construction cost performance was measured and quantified. Data of projects constructed in Indonesia were then obtained through questionnaires from official owner representatives of companies hi Jakarta. Variables in the questionnaire which represented owner quality contribution were then correlated to the same project cost performance variable. In depth analysis of the correlation were then carried out to build regression models of the relationship between quality of owner contribution during conceptual planning phase to project cost performance. The statistical including validation test needs were also carried out in order to provide the guidelines for increasing knowledge in constructability for future projects in Indonesia.

Abstrak :
The Role of Construction Personnel in the Phase of Conceptual Planning in Increasing Construction Project Cost Performance in IndonesiaModern construction has been characterized as a complex and fragmented process. These conditions have been known to lower the quality and cost efficiency of projects. It has been proven that this problem can be partially overcome by implementing constructability, which is based on the integration of construction knowledge into the early stages of planning and design process. Prior research has found a lack of application of constructability by participants in the construction industry, especially general contractors. Because builders can play an important role in implementing constructability, this thesis has addressed constructability as practiced by the general contractors in Indonesia Constructability since 1986 has been defined as the optimum use of construction knowledge and experience in planning, design, procurement, and field operations to achieve overall project objectives. The effective integration of design and construction offers important benefits and opportunities to achieve project objectives. In order to create maximum benefits, the construction input or constructability, has to be introduced at the earliest stages of the project. This investigation describes the constructability improvement related to three key issues derived from literature study; developing the project plan, laying out the site, and selecting major construction methods. Project data for analysis were obtained by distributing questionnaires to corporations in the Jabotabek areas and in project locations in Indonesia which were acting as contractors. The sample questionnaires were also directed to a population of contractors categorized by the characteristics of the organization, the type of work performed, and the type of contractual arrangement. The variables in the questionnaires that were related to constructability and cost performance were assigned scores by the contractor population in the research. The data was then processed for carrying-out correlation and multiple regression modeling analysis. The research proceeded to establish through regressions analysis a non-linear model relating cost performance to two significant constructability variables. Firstly the improvement of construction personnel knowledge and experience for the scheduling preparation, cost estimations and budget. Secondly the improvement of construction personnel knowledge and experience for pre-construction planning as a basic input in the design phase. These findings then provided the basis for deriving conclusions and various recommendations on practical applications to improve constructability during the conceptual planning phase for increasing the cost performance of a project.

Abstrak :
Meningkatnya persaingan dan tuntutan efisiensi pada industri konstruksi menuntut adanya pengendalian mutu yang dikombinasikan dengan aspek ekonomis dan jadwal proyek. Hal ini memotivasi berbagai penelitian yang menghasilkan teknik-teknik peningkatan mutu dan efisiensi/efektifitas dari sebuah proyek seperti total quality management, value engineering, designability, contractability, constructability, operability, maintainability dan sebagainya. Penelitian ini bertujuan untuk mengetahui dan menganalisa salah satu peningkatan mutu proyek konstruksi yaitu penerapan peningkatan constructability pada tahap perencanaan dan perancangan proyek. Pendekatan ini dilakukan karena besarnya pengaruh perencanaan dan perancangan terhadap kualitas, biaya dan waktu pelaksanaan proyek secara keseluruhan. Pelaksanaan penelitian studi kasus ini dilakukan pada sebuah perusahaan nasional yang bergerak di bidang industri konstruksi dengan pola design and build dimana penelitian difokuskan pada pemahaman, pelaksanaan, keuntungan, dan hambatan constructability di perusahaan tersebut dan dua buah proyek yang dijadikan studi kasus. Jenis penerapan constructability secara informal yang didapat pada studi kasus ini diindikasikan oleh tidak adanya prosedur tertulis tentang constructability, rendahnya tingkat lesson learned, tidak adanya koordinator constructability yang ditunjuk secara resmi, masih banyaknya hambatan pelaksanaan dan tidak adanya pencatatan kinerja constructability. Walaupun demikian pada pelaksanaan constructability secara informal ini, bahwa penerapan constructability pada tahap perencanaan dan perancangan terbukti meningkatkan kinerja proyek konstruksi, dengan variabel yang paling berpengaruh adalah penjadwalan berdasarkan construction sensitive dan fasilitas desain dalam mengefisienkan konstruksi.