Disabused of the correspondence theory of truth, the scientist now adopts to the pragmatic theory of truth. Prior to his conversion, the scientistís search for truth meant searching for theories which correspond to the facts, but now that is replaced by a search for theories with instrumental value.
But is this a sensible move by the scientist? The original aim of the scientist's search was the discovery of theories which correspond to the facts, and even though he may no longer label such theories 'true,' nothing else need change.
Suppose that the scientist lost his car keys and searched thoroughly to no avail. The philosopher then convinces him that the word 'key' really refers to a writing utensil, and therefore, advises that he search for that instead.