trial and error

Rock of Ages, on the other hand, was recorded at the perfect moment: after the trial-and-error period, before the decline.

From there, we subjected ourselves to a lot of trial-and-error.

No trial-and-error, no baby hesitation with hand poised—just a sudden assured, controlled action.

How may we recognize this potential teacher without resorting to a clumsy, time-wasting, trial-and-error method?

Its use avoids the wastefulness of the trial-and-error method.