Look at the Boundary
What might be visible from the other domain that isn't visible from mine?
Situation
Capable people from different specialties disagree or unexpectedly miss something.
The idea
Expertise changes which differences, dependencies and consequences appear important. The missing information may exist in the connection rather than inside either person's domain.
Useful when
Cross-functional decisionscustomer/engineering disagreementshandoffsarchitecture/business decisions
Watch for
The goal isn't for everyone to understand everything or to defer automatically to another expert.
Where this came from
Startups, Engineering, Parenting, Knowledge-boundary research