A key point that the UK General Medical Council addressed in its recom
mendations on the undergraduate medical education was the concept of '
core curriculum' (General Medical Council 1993). Although enthusiastic
for the idea of reducing factual overload, many medical teachers foun
d themselves facing the task of how to define what a core curriculum i
s, what should be included and why. Predictably, our initial response
is to include common and important topics, but how common is common, a
nd how does one determine the relative importance of topics? We do not
claim to have unravelled all the ambiguities surrounding the subject
nor to have resolved all the controversies that are inevitably encount
ered. We hope, however, to describe some of the principles that govern
ed our approach and put forward some guidelines, that may contribute t
o the debate.