In this work, the author aims to arrive at a meaningful frame of reference for the earliest occupation of Eurasia. The basis for this endeavour, and the subject of the first part of this study, is a solid chronology of occupation founded on a critical assessment of the evidence. This chronology is then compared to that of various events in and aspects of the evolution of global and regional climates and ecologies, as well as various events in and aspects of hominin evolution itself. Archaeological and biological clues to changing behaviour in Africa and Eurasia over the timespan of 2.5-0.3 Ma are assessed against the background of changing climate and environments in the second part of this work. These form the background against which an attempt is made to provide a context of behavioural and cognitive evolution leading to these earliest colonizations. The primary goal of this discussion of the earliest occupation of Eurasia therefore is not to present the earliest dates with as many dots as possible in remote corners of the World map: the primary goal is to understand how, because of which factors of change, these dots appeared.Based on the author's thesis, this study examines the processes and chronology of the early human dispersal `Out of Africa' to the Old World. Immersing himself in the debate surrounding early human occupation outside of Africa, Marco Langbroek begins by assessing and critiquing claims for the early occupation of Eurasia before 1.4MA, and from 1.