This article is an abstract of the proposal recently submitted to the EU Horizon 2020/CAPS program. The CAPS program aims to support the piloting of Collective Awareness Platforms for Sustainability and Social Innovation. The authors, part of the project consortium members organizations and their close partners involved in the call, came together around the idea of connecting sustainability and social change praxis and related pattern languages within a commons pattern repository, via a systemic pattern language. Each brings a building block of what is needed to create a sustainable and scalable platform for collective awareness and exchange of tacit knowledge on sustainability challenges and solutions oriented towards systemic change. Helene Finidori, Sayfan Borghini, Kurt Laitner, and Takashi Iba are coordinating the concept from a theory to application per- spective. Tom Henfrey, Nadia McLaren and Helmut Leitner are involved in the practical aspects of pattern language praxis, working with practitioners and those who drive change on the ground. Martin Pruvost-Beaurain and Vincent Puig are bringing to the mix exploration of possibilities and the semantic and hermeneutic inquiry that help to organize documented knowledge and discussions related to it. They ensure the liaison between the non-digital world of practice, the IT that 'tools' it, and the philosophical-ethical approach that ensures a critical questioning of the categorization of knowledge. This approach is supported by the work of René Reiners on pattern evaluation and evolution, based on a long experience in the design and assessment of human-computer-interaction concepts, accompanied by the work on pattern repositories by Frank Leymann and Michael Falkenthal.