Backcasting

Starting from the Future

Backcasting is a planning method that starts by defining a desirable future state, then works backward to identify the steps needed to reach it. Unlike forecasting (which extrapolates current trends forward), backcasting begins with where you want to be and asks: "What do we need to do to get there?"

Why Backcasting?

Forecasting assumes that current trends will continue, which is often inappropriate for sustainability challenges where fundamental system change is needed. Backcasting frees you from the constraints of the present and allows truly transformative solutions to emerge.

In SiD, backcasting is particularly useful after the visioning stage. Once the team has a clear picture of the desired future, backcasting can quickly identify the major milestones and actions needed to get there.

The Process

Define the desired end state in as much detail as possible. What does the sustainable system look like?

Identify the gaps between the current state and the desired state. What needs to change?

Work backward from the end state, identifying the last step before reaching it, then the step before that, and so on.

Identify enablers and barriers at each step. What makes each step possible or difficult?

Create the roadmap by reversing the sequence into a forward-looking plan.

Combining with SiD

Backcasting is most powerful when combined with SiD's systemic analysis. The end state should be defined at the system level using RAH indicators, and the steps should be evaluated for network-level effects. This prevents the common pitfall of backcasting from an object-level vision that may not actually lead to systemic sustainability.