Why does compound ideas fail?

The most common reason compound ideas fails: Decomposing the idea intellectually but continuing to act on it as a monolith. You'll know this is happening when someone challenges one part of your plan and you defend the whole thing — because in your mind, it's still one idea. The decomposition only works if each piece gets evaluated independently.

The fix: Take one belief you currently hold about your work, career, or a project — something you'd state as a single sentence. Write it down. Now decompose it: list every assumption that must be true for that sentence to hold. Aim for at least four. For each assumption, ask: 'Have I actually tested this, or am I treating it as given?' Circle the untested ones. You've just mapped the hidden dependencies in a compound idea.

The underlying principle is straightforward: An idea that looks like one thing is often several things fused together, each carrying unstated assumptions that silently constrain what you can do with it.