This volume establishes how English language constructs were measured in Cambridge English examinations over the period 1913 to 2012. An addition to the Studies in Language Testing series, this volume provides an overview of English language testing over the last century, with coverage of key theoretical and practical aspects of the assessment of reading, listening, writing and speaking skills. It includes examples of the Cambridge English exams, old and new, and is the first volume to describe in a systematic way the different theoretical influences which have shaped the development of the constructs underlying Cambridge English exams in the last 100 years.