RII ranging between 76% and 82%. This indicates that these variables have a relatively higher degree of
influence on construction costs. The remaining factors in this group obtained RII ranging between 60%
and 70%, which indicates their moderate significance. The top ranked factors include ‘Contractors’
construction planning and control’ (RII = 0.8273), ‘Availability/adequacy of contractor’s staff and
workers’ (RII = 0.7909) and ‘Contractors’ management team’ (RII = 0.7818).