Behavior driven development uses user stories written in plain English to validate that your application is working as expected. One of the most famous frameworks, Cucumber comes from the Ruby world. We will look at an alternative for the .net developer SpecFlow. Uses the same syntax as Cucumber, integrates with VS and you can write your test using either NUnit or MSTest. We will add WatiN to the mix to drive our browser and validate that our web application does what it's supposed to.