This module examines Rigor, the third of the three shifts required for implementation of the Common Core State Standards for Mathematics (CCSSM). This module is based on the premise that the information from Modules 1 and 2 is well understood. Course Objectives: By the end of the module, the learner will be able to: (1) identify the components of rigor and give examples of each; (2) describe the relationship among the components; (3) determine if a standard is written to align with one of the three components of rigor; and (4) state fluencies required by the CCSSM and those suggested in high school by the Partnership for Assessment of Readiness for College and Careers (PARCC).