Increasing amounts of information are being made available to patients – but how do we know if we are getting it right and meeting people's needs? In this article, we describe how we have employed user testing to test and improve not just information for patients, but also for professionals and others. This is built on the many years of using this technique, first at the University of Leeds and then through the spin-out company Luto Research (http://www.luto.co.uk).