 The plan of this entry is as follows.  Section 1  discusses conceptual issues, distinguishing between different understandings of revolution and between violent and nonviolent revolution; it also distinguishes revolution from resistance, rebellion and secession. Because violent revolution poses the most serious and difficult moral issues, it will be the focus of the remainder of the entry. The morality of nonviolent resistance to political authority is itself sufficiently distinctive, significant and complex to warrant a separate entry.