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Individuals with Rett syndrome need extensive support to actively participate in social interaction and to develop their communication. The overall aim of this thesis was to investigate communication intervention for individuals with Rett syndrome, especially aided symbol-based communication and partner strategies.

Study I was a cross-sectional survey exploring services provided by speech language pathologists (SLPs) in Sweden. Communication aids were often used in the intervention and were found to be useful. Few SLPs used systematic tools for assessment and evaluation and communication partners were often instructed through informal conversations.

In study II, a tool (AVAI) for assessing visual attention in interaction was developed and its psychometric properties were explored. AVAI was also used as an outcome measure in study III. In both studies, the tool was found to be reliable, able to detect change and acceptable to the participants.

In study III, a single case experimental design was applied to evaluate an intervention consisting of aided language modelling whilst using responsive partner strategies and a gaze-controlled device. The adult participants with Rett syndrome (n=3) increased their expressive communication following individual learning patterns. The intervention was appreciated by the participants’ social network.

Study IV was a case study exploring and describing a communication partner’s use of responsive and scaffolding partner strategies in interaction with individuals with Rett syndrome (n=3). The use of these strategies varied in interaction with different individuals with Rett syndrome. The communication partner responded more frequently to communication through a gaze-controlled device than unaided communication.

In conclusion, gaze-controlled devices should be considered in communication intervention with individuals with Rett syndrome. Systematic tools and procedures should be applied in interventions, which is not the case in current clinical practice. Adults with Rett syndrome are able to develop their communication which highlights the need for communication support throughout their lifetime.