Halliday & Matthiessen (1999: 614):
When we talk of “construing experience” as the metafunctional realm of the ideation base, we are referring to the shared experience of the group, the culture and the species; it is by means of dialogue that children gain access to this shared experience and are enabled to construe their own experience with reference to it. And the dialogic nature of discourse serves the child also as a metaphor, as the semiotic manifestation of the social conditions of human existence.