Each type of productivity can be described by generative rules (syntactic, morphological, and phonological rules) that tell us whether a given combination of units is a potential string in the language.
- Dell (2004), Pag. 129

Generative rules define a sequence of categorically defined slots, which are then filled by items that have been retrieved by spreading activation through a lexical network.
- Dell (2004), Pag. 190