Building Information Modeling is a modern technique that has contributed in improvement of construction industries. Early detection of hazards during the life cycle of the project will contribute to protect the working environment from exposure to risks that will affect the time and cost. The changing nature of the sites makes it difficult in identifying the fall risks accurately. Based on BIM 4D simulation, the objective of this study is to create a computer model by using BIM technology to help accurately determine (a) the hazards of falling from the edges (b) the hazards from struck by falling objects, by relying on the opinions of safety experts in identifying potential risks and demonstrating the effectiveness of this technique in facilitating hazards acknowledgment. In this research, Iraqi safety rules and safety rules of OSHA were adopted. The research idea was applied to a school building project under construction as a case study to benefit from the research outputs in improving the safety of school’s buildings projects. The results displayed that the model prepared by the researchers helped the safety managers in understanding the details and sequence of work easily, thus contributed to the precise identification of the falling hazards, use suitable safety equipment for each risk, in addition to the possibility of using this model as a training program for workers in the workplace to help give an idea of the nature of risk which they may be exposed it, increase safety communication and generate time schedule empty from risks. Safety managers believe that this model can contribute to improve workplaces safety and prevent time and cost losses due to reliance on inaccurate methods based on static 2D schemes and sense in risk identification.

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The construction industry is a significant part of every economy and that performance assessment holds the key to its success in national socio-economic goals. Successful Construction projects are closely related to contractor’s performance, where increases a suitable contractor the chances of satisfactory completion of a project in time, cost and quality specified. Contractors’ performance can provide robust benchmarks for contractors and help to identify ways towards performance improvement. Contractor performance can be defined by the level and quality of projects delivered to clients. he objective of this research work is to study evaluate contractor performance for construction projects, and how it can be employed technical grounds (The Method Of Multiple Criteria Complex Proportional Assessment) in the assessment of contractors Performance for construction projects, through the identification of criteria used to select the best contractor in terms performance as well as determining the list contractors of to choose the optimal contractor of these terms. For achieving the goal of the research its data collecting from the literature that addressed the factors Affecting Contractor Performance and method of multiple criteria complex proportional assessment (COPRAS), and finally personal interviews of engineers, contractors and owners qualified. The results of data analysis for the sample and then Rank Order Centroid method (ROC) and distinctive in their application showed that criteria of the quality of work, project management, technical knowledge, and timeliness of performance are the most important criteria for bilateral comparisons between contractors. Finally, and by calculating the relative importance, priorities of alternatives, and the benefit degree we find that the C1 has received the largest share of the benefit and importance. In the end, was a set of conclusions and recommendations of various aspects of the topic from accelerating the application of techniques of decision- making multi-criteria in the evaluation of contractors performance in addition to expediting the application of the systems proposed by the researcher for the evaluation of contractors performance.

The objective of this research is to classify and diagnose the causes of poor quality management in Iraqi construction projects. This study diagnosed fifty-three causes of poor quality management in Iraqi construction Projects. which they divided into eight main groups (Equipment causes, Labors causes, Systems causes, Materials causes, Design and Execution causes, Subcontractors causes, Site staff causes, Contract causes). Then calculated the relative importance of the causes of poor quality management in Iraqi construction projects. Three techniques were used in this study: Ishikawa diagrams, Pareto diagrams, and 5-why techniques. Pareto analysis showed that thirty-six causes out of fifty-three causes represent the most important causes of poor Quality Management, these causes had been filtered by 5-Why analysis. The most important causes were failure to comply with laws and standards and poor compliance to specification, as identified in contract conditions within design and execution causes group, followed by low skill and experience of Contractor’s staff within Site staff causes group and failure to implement a quality control and assurance system within systems causes group.