The problem: Tracking quantities (warehouse thinking) creates mental overhead. Checking “how much oil is left” every week is exhausting.
The core issue: You’re trying to count. The solution is to stop counting and start using passive signals that alert you when you’re low.
Primary answer: Two-Bin System - Physics replaces memory Alternative answer: Reverse Shopping List - Recognition replaces recall Supporting technique: Visual Zoning - Gaps become alarms
The Mental Shift
From: “How much do I have?” (requires measurement) To: “Am I using my backup yet?” (requires only observation)
North: Where this comes from
- Kanban Method (manufacturing origin of Two-Bin)
- Recognition vs Recall (why visual systems work)
- Cognitive Load Theory (why tracking fails)
East: What opposes this?
- Inventory Apps (high friction, requires manual updates)
- Memory-Based Shopping (error-prone, exhausting)
- Warehouse Model (tracking exact quantities)
South: Where this leads
- Two-Bin System (main implementation)
- Handling Opaque Containers (adaptation for non-visual items)
- Freezer Bridge (adaptation for perishables)
West: What’s similar?
- GTD Trusted System (capture without constant monitoring)
- Vending Machine Model (track empty slots, not quantities)