This work describes a model of speech production based on the central role exercised by a speaker's working memory. It is proposed that speakers make intensive use of their working memory when planning, composing and uttering speech, and that a speaker's working memory is guided in its composition processes by an array of co-occurring cues, or constraints, which determine the selection of chunks of utterances in memory. The constraints are: semantic activation, imagery (i.e. the activation of detailed semantic, visual and spatial information), syntax, speech rhythm, prosody and sound repetitions. Speakers are exposed to the perception of environmental information and to others' speech, and these inputs determine the co-occurring act...