This volume reports research that informs the development of reading and listening assessment in IELTS. This volume brings together a set of eight IELTS-related research studies - four on reading and four on listening - conducted between 2005 and 2010. Findings from these studies provide valuable evidence on the validity, reliability, impact and practicality of the IELTS test; they are also instrumental in highlighting aspects needing attention, and thus directly inform the continuing evolution of the IELTS reading and listening tests. The volume reviews and comments on the specific contribution of each study to the ongoing process of IELTS reading and listening test design and development.