The definitive publication of the ten year Southern Hebrides Mesolithic Project. The project aimed to document Mesolithic settlement on the islands of Islay and Colonsay and, in intepreting it, to throw light on a number of major issues: the colonisation of Scotland following the last Ice Age; the nature of early postglacial settlement patterns; the transition to Neolithic and farming communities. The report is divided into nine sections describing the development of the project, palaeoenvironmental studies on raw materials, sea level change and vegetation history. Later sections cover the results of archaeological surveys and excavations, the computer modelling of site location and foraging behaviour and the experimental replication of tool use. The monograph concludes with an overall interpretation of the diverse strands of evidence regarding Mesolithic settlement in this region. A core element is the publication of Bolsay Farm on Islay and Staosnaig on Colonsay. The key feature of the project, however, is the application of a landscape approach to hunter-gatherer archaeology through multi-disciplinary research.