Although international and domestic students applying to English-medium universities may well meet the minimum language entry requirement, recent research indicates that this level of language proficiency often does not provide students with the means to cope effectively with their academic studies (Barthel, 2007; Elder, 2003; Read & Hayes, 2003). To resolve this dilemma our major, multicultural New Zealand university is addressing the problem through implementation of the Diagnostic English Language Needs Assessment (DELNA), a post-entry programme administered to all first-year undergraduate students, regardless of their language background. We use the diagnostic outcomes to guide individual students with particular needs to appropriate forms of academic language enrichment. This paper outlines DELNA's history and administration, student responses to the assessment and the subsequent development and uptake of language support options.