This document reports on a study that examined whether aspects of graduate student teachers' (GSTs) profiles have predictive value in relation to their teaching performance. It summarizes the findings of a previous pilot study and a current study that looked at gender, age, previous degree results and subject area. The current study found that gender and previous degree results were predictive of teaching practice scores, but age and degree subject area were not for the overall sample of 538 GSTs. The document discusses these findings and possibilities for further research.