This project aims to conduct a medium-term follow-up to assess the efficacy of a preventive cognitive behavioural intervention delivered via the Internet to individuals at risk of developing anxiety disorders. Previous work on immediate outcome indicated that the program was effective in reducing depression and anxiety-related cognitions. Forty-two university students with elevated anxiety sensitivity who were randomised either to an Internet-based program over a period of 6 weeks or a waiting list control were followed up at 6 months after intervention. As with the outcome immediately after intervention, significant treatment effects were found for anxiety-related cognitions and symptoms of depression. Long-term outcomes were related to program component satisfaction. (Contains 1 table.)