Isn't all functional programming lean? What does that even mean? While at NDC, Carl and Richard chatted with Bryan Hunter about lean principles and how they apply to functional programming. After a quick debate around the merits of object-oriented programming vs functional programming, the conversation turns to the history and principles of lean. Bryan shows how lean informs your approaches to programming, how you can evaluate your tooling and techniques to build the best software possible. Is functional programming the ultimate manifestation of lean?