I believe it is poosible to scientifically determine whether people generally have many and strong reasons to promote or inhibit certain desires through the use of social tools such as praise, condemnation, reward, and punishment. I also believe that this investigation would make sense of a wealth of moral practices such as the three categories of action (obligation, prohibition, and non-obligatory permission), excuse, the four categories of culpability (intentional, knowing, reckless, negligent), supererogatory action, and. - of course - the role of praise, condemnation, reward, and punishment.