This article describes how St. Louis Community College has created a culture of action using mission-based assessment. By directly linking assessment processes to mission areas such as transfer education, the college has created a central, unifying theme for assessment. Because the mission is everyone's business, assessment in turn becomes everyone's business. The college's mission-based assessment process has become a shared enterprise in which faculty and staff from across departments and across locations come together and engage in thoughtful interpretation in order to develop and design assessment activities; analyze data or information; make recommendations to improve teaching, student learning outcomes, and student support services; and advance institutional effectiveness.