Unlike the predictions made from the 'rank scale' framework, the probabilities that the new model suggests can be changed. Such changed [sic] may be triggered by the context of co-text (which includes the specific point in the structure), or by some aspect of the context of situation.
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[1] This is misleading on two counts. On the one hand, the rank scale does no make "predictions"; it is merely a way of modelling formal constituency such that higher rank units consist of lower rank units. On the other hand, in SFL Theory, despite deploying a rank scale, all features in all systems have deemed to have probability values, and it is variation in such probabilities that distinguishes registers. Moreover, these probabilities are continually altered by the process of instantiation: the selection of features in logogenesis, the unfolding of text.
[2] To be clear, Fawcett has not located 'context of situation' in his model. Figure 12 (p210) identifies 'situation' at the level of 'meaning', not 'context', and where SFL Theory locates 'context', Fawcett has 'belief system':
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