Following the success of two prior conferences, we cordially invite submissions to the Third International Congress on Construction History. Authors interested in presenting a paper should submit an abstract (400-600 words) before 1 April 2008 (extended until 13 May 2008!). Contributions must include the full contact details (name, degree, affiliation, address, telephone, fax, email). The abstract must be submitted as pdf.-file to CH2009@tu-cottbus.de. Out of the list of themes and topics, a keyword should be assigned to the paper. Where there is an overlap between the coverage of several themes and topics, authors should choose the one they consider to be the most appropriate.