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Knowledge + Guidance

Why Do the Edge Cases Still Get Past Us?

You have gotten good at catching what you expect to break. That is not nothing. But every team that says "we can't reproduce it" is describing the same thing: a shared blind spot, not a rare bug. This is not a skills problem you fix alone at your desk. The gaps live in the space between people — in the assumption nobody voiced, the edge case everyone assumed someone else covered. Your team built the blind spot together. You will have to find it together too. Stop asking "did we test enough." Ask "what do all of us believe is impossible, and have we ever tried to make it happen."

◆ How this problem reads on the two dials
GuidanceKnowledge
More coaching
Some to learn
1:1 with AureliusWith others (a Pod)
Some one-to-one
Practise with peers
The team already has the technical skill; what's missing is a repeatable practice for surfacing shared assumptions, which is coached through action, not taught.
How the two dials adapt to you →
What’s really going on

Because you are validating the design, not the assumptions under it. The failures that don't reproduce are the ones your team agreed, without saying so, could not happen. Stop testing what you built. Start attacking what you believe.

🔒 What you’ll build togetherUnlock by starting
A moveAfter every failure that doesn't reproduce, write down the exact assumption that made it seem impossible — post it where the team sees it
A moveAssign one teammate each cycle whose only job is to try to break the design in ways nobody has budgeted time for
A moveBefore calling a design validated, ask out loud: what have we all quietly agreed can't happen here?
A moveKeep a shared, growing list of near-misses and unreproduced failures — review it together monthly, not alone
A moveWhen someone says 'that can't happen,' treat it as a task, not a conclusion — go find out
PractiseThe Blind Spot Audit · a Pod of 4 · 30 min

What changes unlock by starting

  • A shared list of assumptions the team can now name and test, instead of ones nobody noticed
  • Fewer failures reach production without a name or a cause
  • The team argues less about whose fault the miss was, and more about what pattern caused it
  • A repeatable habit for hunting edge cases together, not a one-time review

Related problems

The same struggle, seen by other coaches
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