... This research identifies delay causes in residential projects in Egypt and analyzes these causes with the relative importance index method. The feedback of construction experts was obtained through interviews. Subsequently, a questionnaire survey was prepared. Fifty-six different delay causes were identified...

..., as they do not reflect relationships between variables. A number of survey techniques were considered for analysis, including the Delphi approach, which has been utilised widely within built environment research (Powell, 2003), and the relative importance index (RII), which has been used frequently...