The slides of my talk "Mockist vs. Classicists TDD" at the Softwerkskammer Berlin Meetup http://www.meetup.com/de-DE/Software-Craftsmanship-Berlin/events/227959647/. Abstract: There are two different schools of TDD: the proponents of "London School TDD" ("Mockists") drive their design "outside-in" top-down starting with end-to-end acceptance tests. They focus on the interaction between objects, isolate them with interfaces between them and mock them out in their tests. On the contrary the advocates of "Detroit School TDD" ("Classicists") work bottom-up and try to avoid mocks if possible. In a live coding session I will demonstrate both approaches and discuss their strengths and weaknesses with you.