Writing a mission statement is difficult, especially today when the need for libraries is being openly questioned. Now more than ever, librarians, trustees, and patrons must determine how libraries can best serve their communities and express their conclusions in their mission statements. A clear sense of purpose provides an essential foundation for successful strategic planning for the future. In this article, the author highlights several online resources that provide useful information on writing mission statements. (Contains 1 resource and 12 online resources.)