Humans are capable of remembering information in an active, easily accessible form. However, this is a limited capacity system, which temporarily maintains and stores information, and supports human thought processes by providing an interface between perception, long-term memory, and action. Using the task-span procedure developed by Logan (2004), the current thesis aimed to examine some of the most salient features of working memory. Specifically how processing and storage interact with working memory, the influence of organisational factors on working memory and the relationship between task-switching and working memory.