Dam is an infrastructure that has many benefits for human survival such as a water reservoir which is the solution to the current crisis of clean water in Indonesia. The clean water crisis was anticipated by the government by constructing dam in critical areas with a target of 29 dams to be completed by 2019. But it is not uncommon for work accidents to occur in dam construction that have an impact starting from minor injuries to fatal ones such as death. So that, it is necessary to identify and analyse potential hazards early to prevent such accidents. This research aims to develop a safety plan for preparatory work of dam construction and cofferdam construction by identifying potential hazards that may occur in each work package by reviewing work methods, work activities, and WBS-based dam construction that has been standardized using the qualitative approach method. From the research, there are 20 risk sources of OHS that have the highest potential hazard in preparation work and cofferdam which were dominated by human resources and tools. Furthermore, safety plan had been developed based on the OHS risk sources obtained from the WBS for preparatory work and cofferdam.

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There are still many high-rise building managements that carried out in a conventional method and do not involve the latest ICT. So that the maintenance implementation is not running effective and efficient which causes the maintenance performance of the building is not optimal. Therefore, it is necessary to identify elements and indicators that can be used to evaluate the implementation of e-maintenance in high-rise buildings in terms of both effectiveness and efficiency. This study aims to identify the elements and indicators in the implementation of e- maintenance that affect the performance of maintaining high-rise buildings using the literature study and Delphi methods. First, the elements and indicators were obtained by the literature study and then were validated by the experts. As for the research produced five elements that affect the performance of high-rise building maintenance, those are maintenance policies (planning and development, implementation, systems, and improvement): 15 indicators; WBS (scope and value): 7 indicators; guidelines (procedures and methods, program, tools and equipment): 11 indicators; information systems (organization, management, information technology): 15 indicators, and BIM (utilities, information, functional, technical, and organizational/legal criteria): 9 indicators. The building maintenance performance obtained (failure rate, downtime, cost, and service quality) consists of 14 indicators.