質問: what is the difference between 次第だ/次第で(は) and によって ? what is the difference between 次第だ/次第で(は) and によって ?
回答: if you use 次第だ it should be end of the sentence like "それはあなた次第だ。(it depends on you.) while you say 次第でyou should continue the sentence. "計画は天候次第で変わってくる。"(the plan would change depends on the weather.) 〜次第 and 〜によって are the same meaning!