Continuous Integration is a software development practice where members of a team integrate their work frequently. Each integration is verified by an automated build to find problems as quickly as possible. Many teams discover that this approach leads to significantly reduced integration problems and allows a team to develop cohesive software more rapidly. In our talk, we’ll show how our team uses open-source tools, particularly Selenium Grid and Hudson, to test the web applications we make. Raymond Etornam will cover how we moved from testing them using basic Selenium IDE in Selenese/PHP to a more structured system, where our tests are run using Hudson and Selenium Grid, in Python. Stephen Donner will co-lead, providing more of the historical background.