For framing effects, empirical evidence shows that the impact of frames on public perceptions is mainly determined by perceived importance of specific frames rather than by the quickness of retrieving frames. That is, the way framing effects transpires is different from the way second-level agenda-setting is supposed to take place (i.e., accessibility). On a related note, Scheufele and Tewksbury argues that, because accessibility and applicability vary in their functions of media effects, "the distinction between accessibility and applicability effects has obvious benefits for understanding and predicting the effects of dynamic information environments".