The power of the TEI is realized in interactions, between texts, between programs, between practices, and between members of its community. This theme invites considerations of technical and social applications and approaches, both to the practice of encoding and to the development of local and international communities of use. It includes training in the TEI and related areas, for example incorporating the digital into traditional forms of editing. It addresses integration of TEI-encoded texts at scale, for example in libraries and large corpora, and acknowledges that new research questions and external developments require continuous innovation.