In recent decades, human capital has become one of the most popular and influential research programmes in the academy. Its influence is not limited to economics, but has proved to be significant to many other social sciences; indeed, it has infused social and political debates about education and training. Moreover, human capital has become part of the jargon of many non-economists. Now, to help make sense of this critical concept, Routledge announces a new four-volume collection. It provides an extensive overview of the breadth and depth of human-capital research, highlighting not only the evolution of its theoretical and empirical development, but also the variety of topics that it has spawned. Edited and with a new introduction by a leading scholar, this collection gathers together the very best and most influential works.