The acceptance and use of technological innovations by the building industry has been slow due to various factors. Innovative materials and technologies developed by government research institutes are seldom used by governments in their own construction activities. Frequently, even government tenders for low-cost housing projects specify expensive conventional building materials and technologies instead of proven low-cost technologies developed by government research institutions. Due to lack of public sector demonstration projects, contractors stick to the "proven" technologies that are often unsustainable from the social, economic and environmental point of views, and wide application of new innovative building materials and technologies is impeded.