Abstract
If we accept Popper's idea that the human habitat is described in terms of three worlds, and that there are overlaps between these three worlds, our moral actions and values will also be subject to the same kinds of consideration as a repertoire of behaviours exhibited in a physical environment. We will develop moral habits in a moral habitat and our moral behaviours will also be dependent on the kind of moral habitat in which we find ourselves. There are three main problems to which this analysis leads and on which we will focus in this paper. Firstly, there is the problem of the kind of moral environment—habitat—that we need to provide for human beings if they are to develop the kinds of moral values that we hold to be important. Secondly, there is the question of how we are to develop the kinds of moral habits themselves and thirdly, there is the question of how these moral habits and habitat are to be maintained. If we take Popper seriously then human beings have a crucial responsibility in the creation of a moral third world—that is, a habitat in which human beings can flourish. Schools have an important role as a moral habitat for the inculcation of good moral habits.