1. A method for decision reasoning, the method comprising using at least one hardware processor to: provide a database comprising decisions, questions and reasons; receive, from a user, a selection of a decision being part of said decisions; retrieve, from said database, relevant questions out of said questions, wherein said relevant questions are associated, within said database, with said decision received from the user; receive, from the user, answers to at least some of said relevant questions; process said answers so as to retrieve, from said database, one or more relevant reasons out of said reasons; and display said one or more relevant reasons to the user.