Construing Experience As Categories

Halliday & Matthiessen (1999: 82): 

From a typological point of view, construing experience in terms of categories means locating them somewhere in [a] network of relations.

Social Personæ

Halliday & Matthiessen (1999: 12):

… the social personæ of the interactants … is a model of the interpersonal and ideational distance between speaker and listener.

(Second Order) Agent In Mental Clauses

Halliday & Matthiessen (2004: 301):

… mental clauses with an Inducer …

Mental Clauses: Emanating Vs Impinging As Middle Vs Effective

Halliday & Matthiessen (2004: 301):

… the mental distinction between ‘emanating’ and ‘impinging’ is … the distinction between ‘middle’ and ‘effective’.

Identifying Clause: Decoding Is Medium + Range, Encoding Is Agent + Medium

Halliday (1994: 165):

[With] decoding clauses (those where Token = Identified/Medium) the passive [ie receptive] is … rather rare. By contrast, in an encoding identifying clause, where the Token is Identifier/Agent and the Value is Identified/Medium, passive [ie receptive] is more or less as frequent as active [ie operative] … but only the active [ie operative] will accommodate a further agency …