What is latticework of mental models?

Latticework of mental models is a concept in personal epistemology: Connect what you know about work with what you know about relationships health and creativity. Domain boundaries are administrative conveniences, not real walls. The schemas you build in one area of life contain structural insights that transfer to every other area — but only if you deliberately practice moving knowledge across those boundaries. Integration across domains is what turns isolated expertise into a unified operating system for living.

Example: You manage a software engineering team, and you have built sophisticated schemas about technical debt — the idea that expedient shortcuts create compounding costs over time. You also run a household with a partner and two children. For years, these two knowledge domains have operated independently in your mind: work-you understands systems, debt, and trade-offs; home-you navigates emotions, logistics, and relationships. Then one evening your partner says, 'We keep putting off the hard conversation about your mother, and it is getting worse.' And something clicks. You recognize the pattern. The avoided conversation is emotional technical debt — a shortcut (avoidance) that was expedient in the moment but is now compounding in resentment, unspoken assumptions, and behavioral workarounds. Your work schema for technical debt did not just describe code. It described a structural pattern — deferred maintenance under accumulating cost — that applies identically to relationships. In that moment, you are not applying a work concept to home life. You are recognizing that the concept was never limited to work. The domain boundary was artificial. The pattern was always universal.

This concept is part of Phase 20 (Schema Integration) in the How to Think curriculum, which builds the epistemic infrastructure for schema integration.