If you can only say 'they go together' but not HOW one enables the other, it's association not causation

Why This Is a Rule

Enabling relationships ("A enables B") and associations ("A and B co-occur") feel similar but have completely different implications. Enabling means you can create B by establishing A. Association means A and B happen together but establishing A may not produce B — a third factor might cause both.

The mechanism test distinguishes them: can you articulate the specific process through which A creates the conditions for B? "Exercise enables better sleep" — through what mechanism? "Exercise increases adenosine accumulation and raises core body temperature, which triggers compensatory cooling that facilitates sleep onset." That's a mechanism. "Exercise and good sleep go together" — that's an association. They might co-occur because healthy people do both, not because one enables the other.

This distinction matters for learning and skill development because prerequisite maps (Map prerequisite chains backward before learning — ask 'what must I do first?' until you reach solid ground) assume enabling relationships. If the relationship is actually associative rather than enabling, building prerequisite A won't produce the conditions for target B — and your learning plan has a structural flaw.

When This Fires

• When mapping prerequisite chains or skill dependencies
• When claiming "X leads to Y" in a mental model or plan
• During any causal reasoning where you want to verify enabling relationships
• When building intervention plans (if A enables B, intervening on A should improve B)

Common Failure Mode

Accepting correlation as mechanism: "People who journal are more productive, so journaling enables productivity." Maybe — but it might also be that productive people are more likely to adopt journaling. Without articulating the mechanism (journaling reduces cognitive load by externalizing open loops, freeing working memory for task execution), you can't distinguish enabling from association.

The Protocol

For each candidate enabling relationship: (1) State it: "A enables B." (2) Articulate the mechanism: "A enables B through the following process: [specific steps by which A creates conditions for B]." (3) If you can articulate a specific mechanism → enabling relationship. You can intervene on A to produce B. (4) If you can only say "they go together" → association. Co-occurrence, not causation. Intervening on A may not produce B. Label it as association and investigate the actual mechanism before building plans around it.