For young people with intellectual disabilities (ID), the transition from children's to adult services has long been recognised as a challenging move. One of the aims of the White Paper Valuing People (2001) was to address some of the problems associated with this transition. This paper reports on data from a project which examines the impact of these service changes, and the ways in which transition is negotiated by carers, professionals and users. It presents a conversation analysis of eight tape-recorded formal review meetings at which transition to adult services is discussed. It takes as its starting point the existing interactional work on ID and the way in which this demonstrates the effects of the local and contextual specifics of particular kinds of interaction on the eventual outcomes (e.g. Rapley 2004, Antaki 2001, Maynard and Marlaire 1992). We show that an attempt to allow self-determination in the context of transitions can paradoxically result in undermining user choice and control. We also argue that, while a rule-based approach to practice may offer moral clarity for professionals, it can result in interactional and practical difficulties which cannot be easily reconciled.