trial and error

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trial and error (usually uncountable, plural trials and errors)

1. The process of finding a solution to a problem by trying many possible solutions and learning from mistakes until a way is found.

   Navigating by trial and error may get you there eventually, but using a map is faster.

   • 9 October 2018, A. A. Dowd, AV Club The star and director of La La Land reunite for First Man’s spectacular trip to the moon

     Trial and error was a big part of the process: “We need to fail down here so we don’t fail up there,” Armstrong insists, though even some of the mistakes and malfunctions at ground level cause devastating casualties.

• empirical
• suck it and see