How do we know if we have the right preconditions in our Theory of Change?

There are three simple tests that help determine if you have identified the right preconditions, or building blocks, in a TOC.

• Test One: Is the precondition necessary to fully realize the desired outcome?
• Test Two: Are the preconditions, added together, sufficient to fully realize the desired outcome?
• Test Three: Is it possible to devise a measurable intervention to more fully achieve
  each precondition?

The “necessary” and “sufficient” requirements provide the check and balance between “too much” and “not enough.” The “measurable intervention” requirement provides a reality check – if you can’t influence a precondition, there is no point including it.