The simple/obvious/clear domain represents the "known knowns". This means that there are rules in place (or best practice), the situation is stable, and the relationship between cause and effect is clear: if you do X, expect Y. The advice in such a situation is to "sense–categorize–respond": establish the facts ("sense"), categorize, then respond by following the rule or applying best practice. Snowden and Boone (2007) offer the example of loan-payment processing.