Digital and ICT literacy is considered an important competence for full participation in a knowledge economy and an information society. Consequently, interest at national and international level has emerged to explore the best ways of measuring the extent to which, and how equitably, competence in this area is being achieved. This paper reviews the definitions of digital and ICT literacy that have been adopted in cross-national studies, investigates the approaches to the assessment of digital and ICT literacy that have been employed in those studies and articulates the criteria that should guide the development of a global measure of digital and ICT literacy skills. Furthermore, the paper includes an appraisal of prospects for such a development.