Figure 15 The emergence of a stratified model of context.
It is introduced later in Martin's model of context (1992) as an attempt to differentiate more clearly between the context of culture and the context of situation.
This paper argues that context-aware applications capable of supporting complex, cognitive activities can be built from a model of context called Activity-Centric context.
Where there is disagreement, what is at stake is whether we need a stratified model of context or not – for Halliday, no; for me, yes, absolutely.
There is nothing theoretically or descriptively at stake here in the terminology as far as my model of context and Halliday's is concerned.
All strata instantiate, including register and genre, in my stratified model of context (Martin 2010c), just as context of culture instantiates (as context of situation) and semantics, lexicogrammar and phonology instantiate as text in his; there is no disagreement there.
For seminal papers on register and genre, including detailed argumentation for a stratified model of context, see Martin 2012a, [b]; application of the model to a range of school and workplace settings is illustrated in Christie & Martin 1997.
My teacher Gregory however (who developed his model of context at a time when Halliday's conception of intrinsic functionality was just emerging in SFL) proposed four variables not three.
Nevertheless, HMM/GMM architectures that exploit an underlying shallow or flat generative model of context-dependent GMMs and HMMs [8, 9] are still popular and offer many highly effective techniques, developed over the last two decades, that can largely improve ASR performance.
Martin 1984a is in fact the seminal article popularising this work for an education audience (also not referenced by Hyon). Figure 16 uses the co-tangential circle motif to image the stratified model of context under discussion here.
