David Chappell BA(Hons Arch), MA(Arch), MA(Law), PhD, RIBA has worked as an architect in the public and private sectors and is currently the Director of David Chappell Consultancy Ltd. He frequently acts as an adjudicator and is author of ten books on construction law for Blackwell Publishing.

Andrew Willis BSc, FRICS, ACIArb, is regional managing director of Franklin and Andrews, and is joint author of Practice and Procedure for the Quantity Surveyor, Elements of Quantity Surveying and Specification Writing for Architects and Surveyors.