Singapore Journal of Scientific Research2010-006x2010-0051Science International10.3923/sjsres.2011.59.67Oludolapo AmuOlugbenga Abiodun AdesanyaDavid 1201111This study was carried out to develop mathematical framework for explaining civil engineering project delays in Southwestern Nigeria with the aim of finding solution for their reduction. The study area was the Southwestern states of Lagos, Oyo, Ogun, Ondo, Osun and Ekiti. The sample sizes of 70, 30 and 50 were obtained for contractors, clients and consultants categories, respectively. Three types of respondents (engineer, architect and quantity surveyor) were selected in each category, making a total of 450 respondents. Multi-stage sampling was adopted for selected participants. Data were collected using questionnaires and interview techniques. The parameters for the mathematical expressions were obtained by multiple linear regression analysis method. The results showed that out of 3407 civil engineering projects handled only 24 were completed on time, 1571 were delayed and 1812 abandoned and 17.4, 5.6 and 77.0% of delayed projects were handled by the foreign, indigenised and indigenous organizations, respectively. The regression analysis showed that a unit increase in funding and payment contributed a proportion of 0.273 to the delay of projects, while 0.213 and 0.209 were due to contractor and client factors, respectively. It is concluded that mathematical expressions can explain project delays in Southwestern Nigeria and help to reduce them.]]>Al-Moumani, H.A.,2000Amu, O.O., O.A. Adeoye and 1S.O. Faluyi,2005Amu, O.O. and D.A. Adesanya,2007Aniekwu, A.,1995Aniekwu, A.N. and D.C. Okpala,1987Chan, W.M. and M.M. Kumaraswaswamy,1997Edmonds, G.A. and D.W.J. Miles,1983Frimpong, Y., J. Oluwoye and L. Crawford,2003Ismail, A., M.A. Abbas and B.C. Zamri,2008Odeh, A.M. and H.T. Battaineh,2002Okpala, D.C. and A.N. Aniekwu,1988Olaloku, F.A.,1987Shash, A.A. and N.H. Abdul-Hadi,1992Wahab, K.A.,1977Walker, D.H.T.,1995Frimpong, Y., J. Oluwoye and L. Crawford,2003