 In the decades following Broadbent a great many psychologists devoted themselves to the task of locating the attentional bottleneck that he had postulated. Almost all psychologists writing at this time were guided to some degree by Broadbent’s two-serial-systems-and-a-bottleneck picture of perceptual processing. The question of whether a given task is attention demanding was therefore understood to depend on the question of whether the performance of that task requires the engagement of the small-capacity system that comes after the bottleneck of attention.  Research into the attention-related demands of particular tasks therefore became another route by which to approach the issue of where the attentional bottleneck is located. Broadbent’s two-systems-and-a-bottleneck model was frequently questioned, but for most research into attention in the second half of the twentieth century it was very much the orthodox view. This has now changed. In psychology’s current paradigm, only a few aspects of Broadbent’s picture remain orthodox.