Definition
The SPC Framework (Significance, Persistence, Contingency) is a tool for assessing the long-term value of bringing about a specific state of affairs. It allows for the comparison of different interventions by multiplying three key factors to estimate their total trajectory impact.
Why It Matters
The SPC framework is the ‘long-term value audit’ for any intervention; it allows researchers and philanthropists to quantify the ‘trajectory impact’ of their actions, ensuring that resources are allocated to changes that are not just significant, but persistent and contingent.
Core Concepts
- Significance (S): The average value of a state of affairs over time, relative to the status quo. (How much better is it?)
- Persistence (P): How long that state of affairs will last once it is brought about. (How durable is the change?)
- Contingency (C): The proportion of time that the world would not have been in this state of affairs anyway. (Would it have happened eventually without us?)
- The Long-term Value Formula: .
- How to read: “Value equals Significance times Persistence times Contingency.”
- Meaning / when to use: Multiply the three factors to compare interventions. High value requires a meaningful improvement (S), a change that lasts (P), and something that would not have happened anyway (C). If any factor is near zero, the intervention has low long-term impact.