The State Child Development Centre (SCDC) of Western Australia has been involved in the assessment and management of children with attention deficit hyperactivity disorders over the past twenty years. It is a Centre committed to the multimodal interdisciplinary approach to this and related developmental problems. Incorporated in this approach is the recognition that medication is likely to be an essential component in order to facilitate other measures being effective for a majority of children with well established attentional disorders. However, the Centre recognises that the concept of ADHD is not adequate to explain all the developmental problems of children, An alternative conceptualisation of ADHD as multiple stimuli disorganisation syndrome (MSDS) is proposed.