The reader s rapid assimilation of medical concepts is the key to the continuing success of this best-selling book. A caption explains the concept illustrated on each page and a few simple sentences reinforce the concept with interactive (programmed) learning which links to the following page. Dr Dubin s light and entertaining style known world-wide makes learning enjoyable. Practice twelve-lead tracings at the end establish self-confidence and summarised reference sheets with examples (designed to be copied) provide an excellent review.