"This book makes a major contribution to our understanding of blended language learning, now seen as the contemporary paradigm in language education, and to the neglected art of language program evaluation. It offers a rethink of Kane's (2006) argument-based approach, previously applied to test validation, using it as a methodological framework for evaluating the efficacy of blended language learning initiatives." (Catherine Elder, Associate Professor, University of Melbourne, Australia) "Finally a publication that presents a clear ontology of blended learning within an evaluation framework that is clearly exemplified with four cases of empirical validation. A must-read for everyone involved in educational engineering." (Jozef Colpaert, Professor, University of Antwerp, Belgium) "Offering an innovative but practical approach, this book imaginatively reconceptualises program evaluation as a process of planning, evidence gathering, presenting and appraising an argument that justifies or questions the implementation of blended learning. This book should be read by all those in language education with an interest in evaluation and the quality of language provision." (Anthony Green, Professor, University of Bedfordshire, UK).