With the ever growing quantity of information generated by research into attention deficit hyperactivity disorder (ADHD) and the growth of international cooperation and collaboration, a need has arisen for a simple reference resource. The ADHD Resource was created to be this tool. It has been designed to act as the first point of reference for researchers in the field. It has also been created to facilitate the collaborative effects amongst the research groups. © 2007 Wiley-Liss, Inc.