After these two collections, he proceeds to the division of the types of expertise into "production" and "acquisition". Then he tries to find out to which of these two sub-kinds the fisherman belongs (classification) case, the acquisitive kind of expertise. By following the same method, namely, diairesis through collection, he divides the acquisitive art into "possession taking" and "exchanging goods", to which sophistry belongs. The sophist is a kind of merchant. After many successive collections and divisions he finally arrives at the definition of the model (fisherman). Throughout this process the Eleatic Stranger classifies many kinds of activities (hunting, aquatic-hunting, fishing, strike-hunting).