The ethical principles derive both from the general values of society and from the planner's special responsibility to serve the public interest. As the basic values of society are often in competition with each other, so do these principles sometimes compete. For example, the need to provide full public information may compete with the need to respect confidences. Plans and programs often result from a balancing among divergent interests. An ethical judgment often also requires a conscientious balancing, based on the facts and context of a particular situation and on the entire set of ethical principles.