Textbook Kripkeanism and the Open Texture of Concepts

one imagines producing] an exhaustive list of all the circumstances in which the term is to be used so that nothing is left to doubt.... construct[ing] a complete definition, i.e., a thought model which anticipates and settles once for all every possible question of usage...in fact, we can never eliminate the possibility of some unforeseen factor emerging, ... and thus the process of defining and refining an idea will go on without ever reaching a final stage.F. Waismann, "Verifiability"