Uncle Bob https://8thlight.com/blog/uncle-bob/2012/08/13/the-clean-architecture.html Screaming Architecture - Uncle Bob https://8thlight.com/blog/uncle-bob/2011/09/30/Screaming-Architecture.html Hexagonal Architecture - Alistair Cockburn http://alistair.cockburn.us/Hexagonal+architecture Hexagonal Rails - Matt Wynne http://blog.mattwynne.net/2012/05/31/hexagonal-rails-objects-values-and-hexagons/ Domain Driven Rails - Yan Pritzker https://vimeo.com/106759024 Clean Architecture - Uncle Bob https://www.youtube.com/watch?v=Nltqi7ODZTM Clean Architecture and Design - Uncle Bob https://www.youtube.com/watch?v=Nsjsiz2A9mg Hexagonal Rails - Matt Wynne https://www.youtube.com/watch?v=CGN4RFkhH2M