English-medium universities around the world face real challenges in ensuring that incoming students have the language and literacy skills they need to cope with the demands of their degree programmes. One response has been a variety of institutional initiatives to assess students after admission, in order to identify those with significant needs and advise them on how to enhance their academic language ability. This volume brings together papers from Australia, Canada, Hong Kong, New Zealand, Oman, South Africa and the United States, written by language assessment specialists who discuss issues in the design and implementation of these post-admission assessments in their own institutions. A major theme running through the book is the need to evaluate the validity of such assessments not just on their technical quality but on their impact, in terms of giving students access to effective means of developing their language skills and ultimately enhancing their academic achievement.