This video illustrates one of the key components of the Environmental Protection Agency's "Indoor Air Quality Tools for Schools" (IAQ TfS) process--the school walkthrough. Videotaped at a North Carolina school built in 1999, hosts Keith Flippen and Debra Terry describe what schools in Nebraska, Massachusetts, Connecticut, and Iowa found during their walkthroughs and how they were able to use that information. The video also illustrates some of the most common IAQ problems found in schools, and is particularly intended for schools that are beginning to implement IAQ TfS. (EV)