
20 • Lean Product Development: Make it Work!
stage gate reviews that require weeks of preparation with more frequent,
less formal opportunities to review progress.
THE FOUR VALUE STREAMS OF LEAN
PRODUCT DEVELOPMENT
To make things even more interesting, product developers have four value
streams to optimize if they want to master innovation (Figure2.1): the
customer value stream, the knowledge creation value stream, the product
design and test value stream, and the production value stream.
The Customer Value Stream
Product developers must understand what constitutes customer value
and how to deliver it. is sounds simple, but most c