This document summarizes a presentation on test coverage given by Dorothy Graham. It uses an analogy of travel to different locations to explain what test coverage means and some caveats. Coverage refers to the relationship between tests and the parts of a system being tested, but achieving 100% coverage does not mean everything is tested. There are four caveats discussed: coverage only measures one aspect of testing, a single test can achieve coverage, coverage does not indicate quality, and it only applies to the existing system not missing pieces. The key recommendation is to ask "coverage of what?" when the term is used rather than assuming more coverage is always better.