Case studies
Real investigations.
Every plant has one: the issue that stays open for weeks, that three people have already guessed at, that arrives with almost no clue. These are three of those, real ones, taken from early testing on production equipment.
Each is retold on a different class of machine, with the documents and numbers moved with it, so the site it happened at cannot be identified. What is preserved is the part that matters: the issue as it presented, what Cala surfaced, the check, and what turned out to be true.
Prefer proof that asks for no trust at all? The method is worked in the open, against a public manual, where you can check every line.
The investigations
Two weeks down, and every sensor said fine.
An intermittent placement issue in one corner of the working field, escaping inspection, on a machine that passed every check it had.
A brand-new phenomenon, and a theory that held.
A dimensional oscillation inside large dense sections that no existing explanation covered, and the experiments that pinned it down.
The data was fine. The model was wrong.
Fitting parameters that should have been constant refused to be, until the model itself went under investigation.
A real investigation from early testing on production equipment, retold on a different class of machine so the site, the tool and the people cannot be identified. The reasoning is the part that is true.
Bring the one that's still open.
Load the manual for the tool it is on, and give Cala the issue still sitting there with no root cause. Read the list. Check the citations against the pages they point at. See whether there is something on it nobody has tried yet.