This chapter gives the message of capacity limit of three to four chunks in the average adult is quite pervasive. The general logic by which various types of data could provide more evidence of capacity limits was represented by four different types of evidence. Wilken and Ma offered an alternative account of capacity limits for visual arrays, based on signal detection theory. According to their account, the capacity limit is not because of a fixed number of slots, but rather to neural noise that builds up as a function of the number of items in the array. The great diversity of situations in which evidence on capacity limits can arise, new evidence is apt to be trickling in all the time, both from new studies and from old studies that were overlooked. Either using American Sign Language (ASL) or using a complex task with English materials interferes with that rehearsal process and leaves little beyond a core working memory capacity.