Many care settings are characterized by collaboration between a variety of stakeholders. People without natural speech who rely on augmentative and alternative communication (AAC) are often strongly dependent on the involved stakeholders and collaboration among them. Since collaboration can be challenged by many barriers, this study examines the impact of a complex intervention on collaboration in AAC care. Methods: In a quasi-experimental mixed methods intervention study which include AAC

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... ing, AAC therapy and case management, caregivers of AAC users were surveyed at 3 time points to assess collaboration and case management in the intervention versus comparison group. In addition, semi-structured focus group interviews were conducted with caregivers in the intervention group. Quantitative data were analyzed descriptively and by comparison of means. Qualitative data were analyzed using qualitative content analysis. Results: The Mann-Whitney U-test showed significantly better collaboration in the intervention group with stakeholders that are more actively involved in AAC care, such as schools (p=0.026) and residential or social facilities (p=0.010), but not with passive stakeholders such as health insurance companies. Most aspects of case management were rated significantly better in the intervention group (p<0.001). The focus group results show mainly positive changes in collaboration with the active stakeholders, such as more commitment and openness toward AAC. Conclusion: The results show a positive impact of the intervention on the collaboration between stakeholders involved in AAC careespecially with active stakeholders. In particular, the organization of care and the accompanying case management by the AAC consultation centers seem to positively affect collaboration.