الفهرس 
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Abstract
The Egyptian construction industry suffers from many delays and cost
overruns so that almost none project was free of them, due in large part to
the rework. Therefore, the main objectives of this study are to identify the factors that cause rework and their severity on the performance of Egyptian
construction projects, identification of effective measures to reduce the
occurrence and impact of rework, along with measuring the percentage of
the rework impact on cost and time of the projects. To achieve the research objectives, the researcher carried out a
comprehensive literature review and conducted a pilot study to determine the
causes of rework and measures to reduce rework. Accordingly, 87 factors
causing the rework were identified and grouped into ten categories related to
the client, contractor and subcontractor, contract, design, construction, supervisory, site, labours, material and equipment, and external. In the same way, 17 measures reducing rework have been determined and adopted for this study. Then, the questionnaire survey was used to capture respondents’ views on the factors that cause the rework and their impact on the cost and time of the project and evaluate the effectiveness of measures of reducing rework, where 67 respondents were cited of the 19 different projects selected within Cairo city. The Total Importance Index of Rework Impact (T.I.I.R.I%) has been used to refer to the frequency and effect of the rework factors on cost and time of a project, which used to rank the factors of rework from highest to lowest impact. Also, the Relative Importance Index method (RII) was adopted to evaluated and rank the rework reducing measures. Accordingly,
the results of the analysis showed that the five most important factors that
caused the rework and the most influential in the construction projects in Egypt are: the country’s economic situation (inflation of currency exchange), the schedule compression, design change due to its contradiction with the utilities, change of specifications by the client, and insufficient or weak feasibility study. On the other hand, the results showed that the most effective measures to reduce rework are a selection of qualified contractors and subcontractors, effective communication, proper and effective planning
of the project, experienced supervisors and consultants, and commitment to
quality control and assurance.
According to the analysis results of three case studies, it was found that the percentage of rework costs are ranged from 2.53% to 8.77% of the actual
projects cost, besides the total rework time was ranged from 24.87% to
29.90% of the actual construction period. Furthermore, the more significant causes of rework for case studies were related to change orders arising from end-user or client demand after the work has been completed and design change upon request of the client or end-users. The research concludes with the recommendation of the project parties, the client, the contractor, and the consultant to take care of the results of this research to find out the rework triggers and determine the frequency of its occurrence and impact on Egyptian construction projects. Thus, identifying effective strategies to containment and reduce rework