The chapter discusses cooperative joint activities such as a man and woman jointly constructing a piece of flat-pack furniture. It describes the shared workspace framework for how pairs of individuals can jointly execute such activities.The framework assumes a limited capacity workspace reflecting what the actors jointly attend to at any moment. For cooperative joint activities in general the workspace contains meaningful entities and behaviours that offer joint affordances to the interactants.The combination of the individuals and the shared workspace captures non-monadic aspects of cognition such as alignment and synchrony.