If we encompass a set of data with a hy pothesis involving the fewest possible parameters, and then are con strained by further experiment to add another parameter, we are likely to view the emendation not as a refutation of the first result but as a con firmation plus a refinement; but if we have an extra parameter in the first hypothesis and are constrained by further experiment to alter it, we view the emendation as a refutation and revision.