The Problem With The Obligatory/Optional Move Distinction

Martin & Rose (2007: 239-40):

To complete the picture we can now allow for the possibility of follow-up moves by the secondary actor or knower (with 'f' standing for ‘follow up’):

And if they do follow up, then there is the possibility of a further follow-up move by the primary actor or knower:

We can sum up the various possibilities reviewed here using parentheses for optional moves. The structure potential for action exchanges is thus:

((dA1) ^ A2) ^ A1 ^ (A2f ^ (A2f))

And for information exchanges, we find the same possibilities:

((dK1) ^ K2) ^ K1 ^ (K2f ^ (K2f))

Blogger Comments:

[1] To be clear, on this model, the only obligatory move in the exchange between the waitress and Hendrik is said to be her A1 move Yes. All the other moves, including her offer Wine? and his metaphorical command Could I have a bottle of your best dry red? — which elicits her "obligatory" move — are mere optional extras.

Similarly, the only obligatory move in the exchange between Sannie and Llewelyn is said to be her K1 move Coetzee. All other moves, including her metaphorical command You'll never guess who's here and his question Who? — which elicits her "obligatory" move — are mere optional extras.

[2] Logically, these should read (dA1 ^) and (dK1 ^), not (dA1) ^ and (dK1) ^.

[3] Logically, these should read (^ A1f) and (^ K1f), not ^ (A2f) and ^ (K2f).