This chapter deals with legitimacy in connection to the exercise of public power through unilateral decisions. It can for example concern a prohibition, a permit, an allowance, an authorization, an administrative fine, a tax or a duty to perform something (e.g., tearing down a house that was illegally built). The decision implies public power irrespective of whether the individual through the decision receives what he applied for or was denied it. Society is to a large extent governed through such administrative law and a unilateral decision has consequences for the individual concerned. In the chapter is emphasized that legality is one part of legitimacy and that the responsibilities of the officials with regard to the law in action as well as the judicial review by courts are fundamental to legitimacy. Legitimacy is closely connected to trust.