Int. J. Management and Decision Making, Vol. 8, Nos. 2/3, 2007 297 Copyright ' 2007 Inderscience Enterprises Ltd. Normalisation in the selection of construction alternatives Darius Migilinskas* and Leonas Ustinovichius Department of Construction Technology and Management, Vilnius Gediminas Technical University, Saulơtekio al. 11, LT-10223 Vilnius, Lithuania, E-mail: dariusmg@mail.lt E-mail: leonasu@st.vtu.lt *Corresponding author Abstract: In construction, the selection of effective construction alternatives is based on decision according to technological and economical analysis. The choice and analysis must be made independent of any preferences or interests and must be supported by a precise calculation of significant criteria such as economic benefit, workability of alternatives and investments. The comparison of normalised dimensionless criteria values, using particular optimal solution methods, is one of the basic stages in evaluation process. Therefore, normalisation method must be chosen according to the objectives so as to meet special requirements, with regard to possible inaccuracy or uncertainty threats and influence on the final ranking of the alternatives or even the final decision. Keywords: normalisation methods; uncertainty influence; multi criteria Decision Support Systems; DSSs; game theory. Reference to this paper should be made as follows: Migilinskas, D. and Ustinovichius, L. (2007) !Normalisation in the selection of construction alternatives", Int. J. Management and Decision Making, Vol. 8, Nos. 2/3, pp.297#313. Biographical notes: Darius Migilinskas received a Master of Civil Engineering and is a PhD student in the Department of Construction Technology and Management, Vilnius Gediminas Technical University (VGTU), Lithuania. He obtained his Honour"s Bachelor (2001) and Honour"s Master (2003) degrees from VGTU. He has also participated in Leonardo da Vinci programmes. He is the author of more than ten publications. His research interests and activities include building technology and management, decision making and normalisation methods, game theory adaptation in construction, computer-aided systems in design and construction evaluation. Prof. Leonas Ustinovichius held various positions at Vilnius Gediminas Technical University, Lithuania, such as Dr. (1989), Lecturer (1988#1990), Senior Lecturer (1990#1993), Associate Professor (1993#2002), Senior Researcher (2000#2003), Dr. Habil. (2003), Professor (since 2002), Chairman Laboratory of Construction Technology and Management since 2000 and Chief Researcher since 2003. He is also an Associate Academician of International Information Academy. He is the Deputy Editor-in-Chief of the Journal Technological and Economic Development of Economy. He has participated in Leonardo da Vinci programmes. He is the author of more than 115 publications and 3 monographs. His research interests and activities include multiple