Quick, slightly off-topic question. There's a belief in the industry (I think wrongly) that pretty much the only way to build big complex systems, you need a ce

Quick, slightly off-topic question. There's a belief in the industry (I think wrongly) that pretty much the only way to build big complex systems, you need a central "Enterprise Architect" to model all the business processes and use those to drive down to the technology. As somebody external to Google, it seems to me that this approach largely does not exist at Google (or if it does, it exists only for particular isolated pieces). Is this true? Or rather? What's Google's method for containing, directing and handling this complexity if it's not a traditional EA thinking process?