Purpose: This article debates the complexities of intervening with adults with learning disabilities and support staff in the natural environment and the challenges of evaluating change. Approach: A critical review of the relevance and amenability of communication partnerships for interventions that promote communication growth in context was carried out. Particular consideration was given to the mechanism for change and implications for research design. Findings: The communication partnership is a reasonable focus for interventions aiming to promote the communication of adults with learning disabilities. Combining instructional training with in situ coaching appears to provide the most effective approach. Bringing about change within the dynamic context of communication is challenging and may benefit from an open, investigative design. Originality: This paper synthesises the available evidence on intervening in the communication environment and debates the potential of realist evaluation as a context-focused research design. Harding et al reported an evaluation of a service-based, intervention that enskilled support staff to facilitate communication with adults with learning disabilities. A dynamic process, communication occurs within the social space occupied by people, such as residential, day and educational settings, where information is shared, relationships develop, and interactions proliferate for multiple purposes. Thus the natural environment where communication actually happens, referred to as the communication environment, would seem to be an appropriate place to bring about change to the experiences of adults with learning disabilities and the social opportunities available to them. Back in the nineties, Ware (1996, p.1) summarised the good communication environment as one where '…people get responses to their actions, get the opportunity to give responses to the actions of others, and have the opportunity to take the lead in interaction'. Thus, the communication relationships experienced by individuals and the people who support them, referred to as communication partners, are of interest. Bi-directional influences The communication process is subject to bi-directional influences. Any difficulties that arise in communication do not derive solely from people with learning disabilities, but rather are viewed as outcomes of the interactional process (Nind et al., 2001). The competencies that each person brings to a partnership are mutually influential: the contributions of one affects the other, and vice versa. Around twenty years ago, Kagan (1998, p.817) captured the communication partnership as an 'equation' made up of the skills and experiences of the participants and the availability and use of resources. Where differences exist between the interactants, the equation is susceptible to imbalance, with the locus of control likely to be centred