Department of civil engineering at University of Baghdad witnessed the discussion of master thesis entitled (poor management of construction projects in the implementation phase and its impact on cost deviation) presented by the researcher Abdul Majid Jaafar Ali al-Hasan. The researcher addressed in this study construction projects, their goals and characteristics to be considered as successful. Some of the most important reasons that affect cost are the inability of the company to meet the requirements of the project since it is a specialized or a large enterprise, lack of planning, inaccurate guessing at cost (the ratings were 4.68, 4.62, and 4.48 respectively, depending on Likart Scale). One of the main findings of the research is that only 30% (6 out of a total of 20) companies were based on the detailed analysis of the costing of work.