Martin (1992: 531):
Poynton's realisation principle for contact needs to be considered from the point of view of both system and process. From the perspective of system, the relevant principle is proliferation; the degree of contact determines the predictability of meanings at risk — the less contact, the fewer the choices available and conversely, the more contact, the more options available to be taken up. Alongside this is the process oriented principle of contraction; less contact means that the realisation of meanings selected has to be more explicit, whereas more contact means that more can be left unsaid.
 In SFL theory, the term 'system' is shorthand for 'system-&-process'. Halliday & Matthiessen (1999: 507):
As we conceive of it, … the term “system” is a shortened form of “system–&–process”, there being no single word that encapsulates both the synoptic and dynamic perspectives … .
Previously, as demonstrated here, with regard to 'process', Martin has confused the instantiation process, both with the realisation relation between system and structure, and with structure itself.
 This is asserted without supporting evidence. Such matters are decided by empirical research.
 The exact nature of the risk that meanings face is never actually specified. To be clear, risk is the potential of gaining or losing something of value.
 This confuses realisation with instantiation. The axial realisation of meaning is as semantic structure; the stratal realisation of meaning is as wording. The selection of meaning is the instantiation process, at the level of semantics, during logogenesis (the unfolding of the text).