This study examines whether working memory capacity, a construct of current information processing theory, correlates with fluent foreign language (L2) speech production. It is based on M. Daneman's study (1991), who found significant correlation between individuals' working memory capacity and the fluency with which they can speak their first language (L1). Adapting Daneman's methodology, a set of seven experiments was applied to 16 advanced speakers of English as a foreign language. Working memory was assessed by means of the Speaking Span Test and the Reading Span Test, both in Portuguese and English. L2 fluency was assessed by means of the Speech Generation Task, which was aimed at assessing fluency at the discourse level. Working memory capacity both in Portuguese and English correlated significantly only with the reading-related task; the Oral Reading Task, aimed at assessing fluency at the articulatory level. The results of this test support the task-specific view of working memory capacity, which posits that this capacity is functional, varying according to the individual's efficiency in the processes specific to the cognitive task with which it is correlated. Various figures, graphs, and charts appear throughout the body of the work. (Contains 65 references.) (KFT)