Truth is centred on the form of scientific discourse and the institutions which produce it; it is subject to constant economic and political incitement. The problem is not changing people’s consciousnesses – or what’s in their heads – but the political, economic, institutional regime of the production of truth... (Foucault 1972)

“Truth” is to be understood as a system of ordered procedures for the production, regulation, distribution, circulation and operation of statements.(Foucault 1972)

Truth A system of ordered procedures for the production etc. of statements is centred on the form of scientific discourse and the institutions which produce it; it is subject to constant economic and political incitement. The problem is not changing people’s consciousnesses – or what’s in their heads – but the political, economic, institutional regime of the production of truth system of ordered procedures for the production of statements.

A Motte and Bailey castle is a medieval system of defence in which a stone tower on a mound (the Motte) is surrounded by an area of pleasantly habitable land (the Bailey), which in turn is encompassed by some sort of a barrier, such as a ditch.
For my original purposes the desirable but only lightly defensible territory of the Motte and Bailey castle, that is to say, the Bailey, represents philosophical propositions with similar properties: desirable to their proponents but only lightly defensible. The Motte represents the defensible but undesired propositions to which one retreats when hard pressed.