The construction industry in Nigeria has continually been thriving at the apex of the nation’ economy and has all the while persistently not measured up to global standards largely due to staticity and inadequacies of the planning systems to reliably foresee and forecast what would happen in the construction stage thereby giving rise to costly delays. This research was conducted by reviewing relevant literature and primary data were collected by oral interviews and site investigation which was carried out daily for 11 weeks on three independent sites within the premises of the University of Jos permanent site taking records of all activities in the weekly work programs and subsequently comparing the work progress with the work program and taking records of the various reasons for plan deviation.

Keywords : Assignments, Construction Sites, Delay, Lean Construction, Trivial Factors, Workflow, Vital Factors.