The Reasons Why Fawcett Prefers The Term 'Realisation Rule'

Fawcett (2010: 40n):

At various points in his writings, Halliday contrasts the systemic functional view of 'language as a resource' with the Chomskyan view of 'language as a set of rules'. Hence his strong preference for the term "realisation statement" over "realisation rule". Like many other systemic functional linguists, however, I take the view that, in defining the 'resource', we necessarily use a type of 'rule'. Thus a system network is itself a set of 'rules' about what features may be chosen under what conditions. This was first demonstrated in a fully explicit manner in the appendices to Hudson (1976), and similar 'rules' are found in the representation of the system network in a computer implementation in Prolog (as described in Fawcett, Tucker & Lin 1993). And realisation statements are even more obviously a type of 'rule'. In other words, while a systemic functional grammar does not have 'phrase structure rules' and 'transformational rules', it does have other types of rule. Here, then, we shall treat the terms "realisation rule" and "realisation statement" as interchangeable.

Blogger Comment:

[1]  The word 'rule' is problematic because encompasses two distinct types of modality: modulation  (obligation) and modalisation (usuality/probability).  As modulation, it also encompasses two distinct types of speech function: command and (modulated) statement; and the latter nullifies the distinction between 'rule' and 'statement'.

The term 'realisation statement', on the other hand, has the advantage of both specifying statement, rather than command, and encompassing probability (modalisation) as a property of system potential.

[2] This is an instance of the logical fallacy known as Argumentum Ad Populum, since it invokes the beliefs of (unspecified) others as support for the proposition.

[3] On the one hand, this is a bare assertion, unsupported by reasoned argument: the logical fallacy known as Ipse Dixit.  On the other hand, it is demonstrably false, since the notion of 'defining' does not entail the notion 'rule'.

[4] The use of thus here is misleading, since it gives the false impression that the statement that it begins follows logically from the preceding unsupported bare assertion.

[5] Since this is a bare assertion, unsupported by reasoned argument, the reference to Hudson (1976) constitutes an instance of the logical fallacy known as Appeal To Authority (Argumentum Ad Verecundum).

To be clear, a system network is organised on the basis of logical relations, such as:

• elaboration (delicacy)
• extension: alternation (disjunct options)
• extension: addition (conjunct options)
• enhancement: condition (entry conditions)

and to "read out" a traversal of a network is to produce statements of the type:

if X, then either Y or Z, and if both Z and A, then B or C.

For strict sense in which statements are a type of rule, see [1] above.

[6] Here Fawcett cites his own work as evidence in support of his own view.  This might be interpreted as the logical fallacies known as Appeal To Accomplishment and, on the basis of this critique, False Authority.

[7] This is another bare assertion, unsupported by reasoned argument.  For the strict sense in which realisation statements are a type of rule, see [1] above.

[8] On the one hand, this is another bare assertion, unsupported by reasoned argument.  On the other hand, it makes use of the logical fallacy known as Argument From Repetition (Argumentum Ad Nauseam).

[9] Here Fawcett, having purported to argue for 'rule' over 'statement', concludes by regarding the alternatives as interchangeable.