The original approach to TDD has caused some confusion over the years. The problem is that the principles and approaches just weren't structured enough. In 2006, Dan North wrote an article in Better Software magazine (https://www.stickyminds.com/better-software-magazine/behavior-modification). The purpose of the article was to clear up some of this confusion and help to reduce the pitfalls that developers fell into while learning the TDD process. This new approach to TDD is called Behavior Driven Development (BDD). BDD provides a structure for testing, and a means of communicating between business requirements and unit tests, that is almost seamless.