In this chapter, Underwood proposes the perception of film and the viewer’s processing of film cuts. Underwood determines there to be three editing errors: 1- small displacements of the camera position or a change in sizing in on-screen objects; 2- the reversal of the camera position (breaking the 180-degree rule); and 3- disobeying the linear sequence of narrative action. Through a controlled study, Underwood noted that viewers’ eye movements increased with the second- and third-order errors of editing the cut. The information is presented very analytically and is reliable due to Underwood’s incorporation of his experiment. This chapter is useful to my research as it makes it apparent that the 180-degree rule and narrative structure are two primary considerations with editing shot-to-shot. Upon reflection of this source, I will need to research more into the psychological influences behind the cut in film editing.