It results in an approach to ethics which combines deontology, consequentialism and virtue ethics. Like deontology, rule consequentialism holds that moral behavior involves following certain rules. Virtue ethics differs from both deontology and consequentialism as it focuses on being over doing. Attempts have been made to reconcile deontology with virtue-based ethics and consequentialism. A good example of ethical absolutism is Kantian deontology. His fields of expertise are jurisprudence, political philosophy, ethics, axiology, deontology and constitutional theory. Teaching must also include foreign languages, epistemology, psychology, medical ethics and deontology. Christian hedonism was developed in opposition to the deontology of Immanuel Kant. Deontology is the "theory of duty or moral obligation". Activities include a committee on Deontology and a working group on Professional Indemnity Insurance.