1. Most versions of generative phonological theory contain a provision for restricting the ordering of rules in the grammar of individual languages.1 The use of language particular, or extrinsic, ordering statements has recently been challenged by Koutsoudas, Sanders & Noll (1974). These authors propose an alternative theory whose principal claim is that the ordering of rules follows from universal principles. Within this theory, which we may term the Unordered Rules Theory, a derivation proceeds as follows:
(i) (a) A representational string is checked against the structural descriptions of all the rules. If only one rule is applicable, then that rule is applied (optionally, in case the rule is optional); if two or more rules are applicable, then universal principles, such as (6) below, may enforce the applicational precedence of one rule over another rule; if the conditions of the universal sequencing principles are not satisfied, then the rules are applied simultaneously.