Publication of principles-of-product-development-flow, Reinertsen's magnum opus. Organized 175 principles across economics, queueing, variability, batch size, WIP, flow control, sequencing, and decentralized-control. Coined "second generation lean product development" to distinguish his economic approach from mechanical application of manufacturing lean tools. This work directly influenced david-anderson's Kanban Method and dean-leffingwell's SAFe framework.