Trial and error: the process of finding a correct method by repeatedly trying different approaches and learning from failures.
新しいシステムは試行錯誤の連続で、やっと安定した。
The new system went through trial and error and finally stabilized.
試行錯誤しながら問題を一つずつ解決していった。
We solved the problems one by one through trial and error.
試行錯誤の末に、より良い方法が見つかった。
After much trial and error, a better method was found.