The most dangerous projects aren't the ones visibly failing—those get attention, resources, management focus. The dangerous ones are at 94% complete. Everyone's exhausted. The launch date is set. Marketing has announced. Stakeholders have moved on mentally. This is exactly when the fox gets his tail wet. Wei Chi (未濟) means 'not yet across'—and the I Ching is specific about what fails: overconfidence at the threshold. You've navigated the hard 90%. The last 10% should be trivial. So you rush. You cut corners. You assume the difficult part is behind you. Then: production outage. Security breach. The thing you didn't test because 'obviously it works.' The Death Star II is the perfect icon: massively powerful, nearly operational, and that 'nearly' is where the Rebellion flies straight through. Not a design flaw in the completed sections—a gap in what's unfinished. The Empire's failure wasn't technical; it was temporal. They acted as if 'almost done' and 'done' were equivalent. Fire over Water: opposing forces not yet integrated. In your system, this is backend and frontend not quite aligned. Database migrations half-run. Feature flags in inconsistent states. The staging environment that's 'basically prod.' These aren't minor gaps—they're opposite forces (what-should-be vs. what-is) moving in different directions. Here's the discipline Before Completion demands: treat 95% like 50%. The last percentage points aren't cleanup—they're integration, the hardest phase. Everything up to now was building components. Now you're making them work together, which means discovering all the assumptions that don't align. The fox tail gets wet in the last step because that's when you're most tired and least cautious. Audit your almost-finished projects. Are you treating them as complete? Have you stopped testing rigorously? Are you assuming 'just works' for the remaining pieces? That assumption is the tail in the water. Before Completion isn't pessimism—it's recognition that different forces (rising fire, falling water) don't automatically harmonize just because they're in proximity. The I Ching ends with this hexagram deliberately. Not 'After Completion' (that's #63). It ends at the threshold, at almost, at the moment that demands maximum vigilance disguised as minimum risk. Every project, every sprint, every release: the last 5% is where opposing forces either integrate or catastrophically misalign. The superior man is careful in differentiation—he doesn't treat 'nearly done' as 'done.' He keeps testing, keeps checking, keeps his tail dry until he's actually across.