Ruchika AthukoralaTMJA Cooray2014-12-232014-12-232014Annual Research Symposium,Faculty of Graduate Studies, University of Kelaniya, Sri Lanka; 2014 :111phttp://repository.kln.ac.lk/handle/123456789/4920The construction industry plays a vital role in the socio economic development and national fiscals in any country. Usually it provides a considerable share towards the Gross Domestic Product (GDP) and Gross National Product (GNP) of the economy. Further it helps to bring lot of development goals for any country such as providing infrastructure, technology, machinery, engineering services and employment opportunities.ArticleMathematics