This paper uses the methodology of conversation analysis (CA) to examine the practice of co-constructed turn and utterance production in impaired communication. An investigation of the conversations between two family dyads, featuring one person with dysarthric speech and one with aphasic language, reveals one way in which single turns and utterances are produced through the collaborative activities of two people in interaction. Such a practice is shown to operate without problems for the participants or the need for explicit acceptance by the speakers. It is proposed that co-construction in disordered speech and language is one way in which communicative competence is accomplished. By drawing attention to similarities in the consequences of dysarthria and aphasia in everyday interaction, it is suggested that researchers and clinicians might profitably look across disorder-specific boundaries. (Contains 3 notes.)