 The Cambridge analytical school, led by Moore, Broad and Wittgenstein, has attempted so to analyse propositions that it will always be apparent whether the disagreement between philosophers is one concerning matters of fact, or is one concerning the use of words, or is, as is frequently the case, a purely emotive one. It is time, I think, that a similar attitude became common in the field of educational theory. (Hardie 1962: xix)