Abstract
Although group work is widely used by primary teachers in most Key Learning Areas, this is
not always the case in mathematics. Why do teachers behave in this way? Argyris and
Schon (1974) claimed that behaviour was driven by individual action theories. This study
used the Theory of Planned Behaviour (Ajzen, 1988) to uncover teacher action theories with
a sample of NSW upper primary teachers (N = 115). It will discuss these theories in order to
assist teachers in their critical reflection of current practice.