The LNCS Transactions on Foundations for Mastering Change (FoMaC) intend to establish a forum for foundational research that fosters a discipline for rigorously dealing with this phenomenon. In particular it addresses the very nature of today’s agile system development, which is characterised by unclear premises, unforeseen change, and the need for fast reaction, in a context of hard to control frame conditions, like third party components, network-problem, and attacks. We envision focused contributions that reflect and enhance the state of the art under the perspective of change. This may comprise new theoretical results, analysis technology, tool support, experience reports and case studies, as well as pragmatics for change, i.e. user-centered approaches that make inevitable changes controllable in practice.