Practitioners of Customer Development, Lean Startup and Enterprise Architecture can all learn from each other. But they shouldn’t enforce their views on each other as there are some incompatibilities. Let’s see how enterprise architecture in startups can exist. Background The Startup culture and methods have largely been defined by Steve Blank who wrote The Startup Owners Handbook and later, by Eric Ries who wrote Lean Startup. Both of these consider how newly-created companies can grow quickly and in the right direction for their founders and customers. Many authors and speakers followed, but for this article, we’ll mainly focus on these two. Enterprise Architecture (EA) functions can be found in many large, mature organisations that have a need to get a grip on their ICT* landscape.