The development of HDM-4 wouldn’t have been possible without the significant contributions (financial and intellectual) of a large number of countries, organisations and individuals. It is difficult to establish a comprehensive list; we apologize to those whose name has been omitted.

Donors

• HDM-4 version 1: Asian Development Bank, Denmark, FHWA (USA), Finland, France, Japan, Madagascar, Malaysia, PIARC, Swedish National Road Administration (SNRA), United Kingdom Overseas Development Administration (ODA), the World Bank
• HDM-4 version2: Australia, Canada-Quebec, France, Japan, Latvia, New Zealand, Norway, Portugal, Switzerland, Tanzania, UK (DFID) and the Asian Development Bank

Management

• At the World Bank: C. Harral, C. Hoban, M. Juhel, W. Paterson, A. Pellegrini, R. Scurfield,
• At the World Road Association (PIARC), the Secretaries General: B. Fauveau (1995-1998), J.-F. Coste (1998-2002), J.-F. Corté (2002-2014). N. Robertson project coordinator (1998-2002), P. Joubert and A. Caroca, associate project coordinators, Raimo Tapio (FinnRA) as Chair of the PIARC HDM-4 project Committee
• At the University of Birmingham, ISOHDM Project Secretariat at the Highways Management Research Group (HiMaRG) led by H. Kerali (till 2002) then M. Snaith.
• For the HDMGlobal consortium comprising the following partners -the University of Birmingham, Scott Wilson Kirkpatrick & Co. Ltd, WS Atkins, ARRB Group Ltd, Ponts Formation Edition, Instituto Chilano Del Cemento Y Del Hormigon, Scetauroute International and TRL Ltd: M. Snaith, R. Mesnard with the Chief Executive Officer, E. E. Stannard.

System design and software development

• The HDM-4 Version 1 and Version 2 software was designed and developed at the University of Birmingham, School of Civil Engineering: Key people include Prof. H. Kerali, Prof. M. Snaith. J.B. Odoki provided key technical review and specifications for input into the software. The software development team comprised Eric Stannard and David Wightman, who designed and developed the software to meet the specifications provided by the ISOHDM project. 

Development and calibration of models and drafting of the documentation

• ARRB, FinnRA, N D Lea International Limited based at the Road “Research Institute in Malaysia (IKRAM), TRRL
• S. W. Abaynayaka, C. R. Bennett, J. B. Cox, I. G Greenwood, U. Hammerstrom, H. Hide, H. Kerali, V. Mannisto, G. Morosiuk, J. B. Odoki, W. D. Paterson, M. J. Riley, R. Robinson, D. C. Wightman, E. E. Stannard, T. Toole, D. McMullen, P. Yuli.

Acceptance testing

• Organized and led by P. Joubert with the inputs from R. Archondo Callao, A. Caroca, , I. Cossens, J. Favaloro, L. Kannemeyer, N. Robertson, A. Spernol, J. Weligamage, J. Yeaman.

Translation of the software and documentation

• French version, at the Laboratoire Central des Ponts et Chaussées: P. Joubert
• Spanish version, at the Instituto Mexicano de Transporte: R. Solorio, R. Hernandez, J. Bustamante