 One point of clarification. Ross says the act which is our actual duty or obligation in our situation is the one, out of the range of acts open to us, with the greatest balance of prima facie rightness over prima facie wrongness. It is possible, of course, all acts open to us will have on balance a greater amount of prima facie wrongness over prima facie rightness. In this case, one presumes, Ross will say our actual obligation is the act, of those open to us, with the least amount of prima facie wrongness over prima facie rightness on balance.