This workshop intends to elaborate on new and emerging crit- ical approaches that aim to question the nature of contempo- rary computational artefacts. By interrogating interactive sys- tems from a perspective that is focussed on the arrangement of their constituent parts and the relations between them, we seek to challenge the constructive paradigms that might have led to those configurations. In particular, with this workshop we will introduce and further explore De-Computation as a methodology, and Un-Crafting as a method, both targeting a critical examination of contemporary computational arte- facts and the interaction paradigms they follow. Both De- Computation and Un-Crafting approach and explore possi- ble computational futures by critically examining the present. The workshop will include collaborative hands-on activities with reflection in practice and discussions around the topic. We are inviting interdisciplinary viewpoints that will enable us to further ground De-Computation and Un-Crafting in a diverse set of contexts.