[trial and error] n (1806): a finding out of the best way to reach a desired result or a correct solution by trying out one or more ways or means and by noting and eliminating errors or causes of failure; also: the trying of one thing or another until something succeeds
TRIAL AND ERROR
Meaning of TRIAL AND ERROR in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012