Free will is the ability of agents to make choices free from influence. Although we commonly believe that we are free to make choices, historically there has long been argument over the reality of this perception. In philosophy the topic of free will is concerned with the careful definition and exact nature of free will, and its limitations. 

 ::Only an example: other lead-in formulations are possible, of course. From there, the separate topics can be given full paragraphs to outline their positions and introduce the lengthy considerations of the body.