We are united by the common goal (1) of keeping each other informed, through national and international activities and news relating to digital exercises based on STACK as Open Educational Resources, and of staying aware of the state of the art in related fields such as the linking with dynamic geometry (JSXGraph), learning analytics, adaptive exercise control, multidimensional feedback and other areas as well as (2) sharing STACK tasks in the WiMINT subjects amongst ourselves and with external partners, and ensuring the quality assurance and documentation of these tasks, in order to (3) continuously expand our teaching-related network for the exchange of information and tasks, and open it up to teaching staff across a broad spectrum of subjects.