Halliday's Systemic Functional Linguistic Theory ('Systemic Functional Grammar') is a scientific theory with a precisely defined architecture that provides the means of identifying misinterpretations of it.
Systemic Functional Linguistics, on the other hand, is a movement, the members of which have responded to a call to improve humanity by teaching students and/or analysing texts. Because it is the movement that is paramount, it is not so much the theoretical consistency of the work that matters, but merely the fact that the work is 'Systemic' (i.e. 'us' not 'them'). When members of the movement die, they are chiefly praised for the extent to which they served the 'cause'.
Systemic Functional Linguistics, on the other hand, is a movement, the members of which have responded to a call to improve humanity by teaching students and/or analysing texts. Because it is the movement that is paramount, it is not so much the theoretical consistency of the work that matters, but merely the fact that the work is 'Systemic' (i.e. 'us' not 'them'). When members of the movement die, they are chiefly praised for the extent to which they served the 'cause'.
