“…Indeed, McNamara (1991) raised the question, of whether or not it is possible to distinguish SMK from PCK. Aubrey (1997) and McEwan and Bull (1991) seemed to agree with McNamara (1991) and argued that there is no distinction between SMK and PCK and that all knowledge is pedagogic. Aubrey (1997) defines 'pedagogical subject knowledge' (PSK) as, the superordinate category which subsumes the sub-category of subject-matter knowledge, on the one hand, and knowledge of young children's subject understanding on the other, and incorporates curriculum knowledge which, in providing the means to represent this subject matter in ways which make sense to children, exemplifies teachers' pedagogical reasoning (Aubrey, 1997, p.164) While these definitions reflect the idea that PCK combines the subject with teaching they include everything that teachers might need to teach mathematics, and they do not offer the opportunity to make a distinction between teachers' actions, knowledge and beliefs.…”