“…Al-Mashari & Zairi (1999) thus offer a unique opportunity for conducting studies oriented to identify critical factors that can influence the success of BPR implementations. Most significantly, the mixture of results made the issue of BPR implementation very important (Bhatt, 2000;Abdolvand et al, 2008;Shin & Jemella, 2002;Siha & Saad, 2008;Singh & Kant, 2008;Vergidis et al, 2008). Hence, based on the analysis of past researches, the purpose of this paper is threefold: Firstly, to identify the CSFs of BPR implementation efforts in the Nigerian oil and gas industry; secondly, to evaluate the effects of the BPR CSFs on the operational and the organizational performances of the Nigerian oil and gas companies; and finally, to examine the effects of the operational performance (primary measures) on the organizational performance (secondary measures).…”