1. Auchi Polytechnic,School of Environmental Studies,Department of Quantity Surveying,Auchi,Edo State,Nigeria
2. Universiti Tekinologi Malaysia,Faculty of Built Environment and Surveying,Department of Quantity Surveying,Johor Bahru,Johor,Malaysia
3. University of Benin,Faculty of Environmental Sciences,Department of Quantity Surveying,Edo State,Nigeria