TY - JOUR
T1 - The predictive ability of Bromilow's time-cost model
AU - Ng, S. Thomas
AU - Mak, Michael M.Y.
AU - Skitmore, R. Martin
AU - Lam, Ka Chi
AU - Varnam, Mark
PY - 2001/3
Y1 - 2001/3
N2 - Bromilow's log-log time-cost (BTC) model is tested and refitted with a new set of data for Australian construction projects completed between 1991 and 1998. It is shown that, as anticipated by earlier research, different parameter estimates are needed for different project types, with smaller industrial projects taking less time to complete than the smaller educational and residential projects. This results in the development of two separate models, one for industrial projects and one for non-industrial projects. No changes in parameter estimates are needed for projects with different client sectors, contractor selection methods and contractual arrangements. Alternatives to the log-log model failed to produce any improved fit. Finally, the results are compared with previous work to indicate the extent of changes in time-cost relationships in Australian construction projects over the last 40 years. This indicates a clear improvement in construction speed over the period. Furthermore, the 'public' sector group in particular has exhibited a greater variation (up to 132%) over the years.
AB - Bromilow's log-log time-cost (BTC) model is tested and refitted with a new set of data for Australian construction projects completed between 1991 and 1998. It is shown that, as anticipated by earlier research, different parameter estimates are needed for different project types, with smaller industrial projects taking less time to complete than the smaller educational and residential projects. This results in the development of two separate models, one for industrial projects and one for non-industrial projects. No changes in parameter estimates are needed for projects with different client sectors, contractor selection methods and contractual arrangements. Alternatives to the log-log model failed to produce any improved fit. Finally, the results are compared with previous work to indicate the extent of changes in time-cost relationships in Australian construction projects over the last 40 years. This indicates a clear improvement in construction speed over the period. Furthermore, the 'public' sector group in particular has exhibited a greater variation (up to 132%) over the years.
UR - http://www.scopus.com/inward/record.url?scp=0035281795&partnerID=8YFLogxK
U2 - 10.1080/01446190150505090
DO - 10.1080/01446190150505090
M3 - Article
AN - SCOPUS:0035281795
SN - 0144-6193
VL - 19
SP - 165
EP - 173
JO - Construction Management and Economics
JF - Construction Management and Economics
IS - 2
ER -