Imo, the key to reliability is to avoid backward steps.

It's like a ratchet: we only want to move forward.

Unit tests give teeth to the ratchet.

There can be no kaizen (continuous incremental improvement) unless the
overall direction of all changes is forward.

Of course, there may be retrograde motions, provided that they brief
and temporary.  When backsliding happens, unit tests or other test
scripts ensure the movement is temporary.

Edward

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