Itheyibhile yesilayidi ye-PT eyenzekayo ifumaneka kwiimodeli ezine, kunye noyilo oluncinci, olulula olunciphisa iiyure zomntu kunye nofakelo, kwaye kulula ukuyigcina kunye nokudibanisa.Ingasetyenziselwa ukutshintsha izinto kuwo nawuphi na umgama, ukudluliselwa kwamanqaku amaninzi, ukuchongwa kwangaxeshanye okanye ukungalingani kunye nokubeka izinto kwiipalati / amabhanti okuhambisa / iibhokisi kunye nezixhobo zokuvavanya njl.