Operational plausibility

Third, as is obvious from cursory observation relating to the second body of evidence, The fact that people are indeed able to speak and write, and to comprehend texts (if often imperfectly) assures us that linguistic systems are able to operate for producing and comprehending texts. Therefore, a model of "linguistic structure" cannot be considered realistic if it cannot be put into operation in a realistic way. This principle, the requirement of operational plausibility has also been mentioned by Ray Jackendoff (2002).

Source

Lamb, Sydney M. "Linguistic structure: A plausible theory" in [Language Under Discussion], published online June 2, 2016.