The phrase "taking a decision", by contrast, only refers to the decisive moment itself, and not to the process leading up to it. It has more formal connotation, and an implication that the decision will have serious consequences, and that the person deciding will be responsible for them; it has a sense of finality about it.decision (on/about something) | decision (to do something) a choice or judgement that you make after thinking and talking about what is the best thing to do