The technique of back casting is essentially the reverse of forecasting and it works like this:
You specify a future goal, i.e. a stage in your business, a phase in your life or a project deliverable, then you work backwards in designating and designing the process from that goal back to your starting point. You are then left with a valuable roadmap to the attainment of that goal. Like LEAN Value Stream Mapping, back casting helps to ensure there are no wasted or extra steps throughout the process, and more importantly, identifies those steps needed to achieve the objective. Once the back-casting process is complete, the next step is the implementation of the roadmap!