الفهرس 
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Abstract
Construction delays are a common Phenomenon in civil engineering projects in Egypt including road projects. Therefore, it is essential to study and analyze causes of construction delays. This report studied a list of construction delay causes gathered from literature having different types of construction, different countries, different periods and different numbers of delay causes and delay groups. A questionnaire and personal interviews have formed the basis of this report listing 293 delay causes. The questionnaire survey was distributed to 500 construction participants who represent consultants, contractor’s and site/design engineer’s excluding the owner representing the government in road projects as one party only. A number of 389 questionnaires were received and 186 responds were Suitable for analysis. ,Relative Importance Index (RII) is calculated and according to the highest values the top twenty and the least twenty delay causes of construction projects in Egypt are determined. A case study is analyzed and compared to the most important delay causes in the report. The test results reveal good correlation of causes and groups between contractor’s and site/design engineer’s and between consultants and site design engineers and a somewhat low correlation between contractors and consultants. So a clear answer for the question ”Are there certain delay causes that could be avoided to complete road projects without having time overruns affecting construction industry in Egypt?” was, that Causes and groups causing delays are country, location and project specific and there are no root causes that can be taking for granted to be the most effective or the least
effective delay causes. Keywords: Delay causes, Delay groups, Road Construction Projects, Questionnaire, Consultants, Site/design Engineers, contractors, Relative Importance Index (RII), Egypt.