Developing The Lean Spec: Episode 13

Previously, we've talked about the heirarchical list of
information: product level, device level, feature level which just
captures one aspect of the fixed things in the product (that don't
change with time). Its an incomplete picture - so then we have to
take each feature/functionality "name" and treat it as a systems
and signals block. Then determine how they're related to each other
and what flows between each block - how the information flows from
internal, to external, and displaying how that works. In this
episode, Cindy and Malcolm discuss systems thinking as applied to
product development.