The Two Loop model is a nonlinear theory of change based upon the ideas of living systems. It provides us with insight into the simultaneous growth and decline process that are underway within a system during a transition period. In this way, it provides a heuristic for us to better try and recognize and connect the past to the future during a change process. It likewise gives us the possibility to try and come to some consensus about where we might be as a group in this process of change and the best actions to take at different stages. This guide will be of relevance for anyone involved in a complex organizational change process.