Few things are more important for school safety and security than controlling access to buildings and grounds. It is relatively easy to incorporate effective access control measures in new school designs but more difficult in existing schools, where most building and site features cannot be readily altered or reconfigured. The National Clearinghouse for Educational Facilities (NCEF) publishes 25 NCEF Assessment Guides covering a wide range of school safety and security measures. Those addressing access control are included in this paper. Use them for thinking about and devising better ways of controlling access to and within your school. (Contains 11 resources.)