In manufacturing, inventory is physical. You can see boxes stacking up on the warehouse floor. In product development, inventory is invisible. It consists of design documents, unmerged code, untested features, and unvalidated ideas. Because you cannot see this inventory, it is easy to ignore the massive financial holding costs associated with it. The Role of Variance
Identifying and filtering ideas based on customer engagement and market need. principles of product development flow pdf
Unfinished requirements, untested code, and unlaunched features are queues of inventory holding locked up capital. In manufacturing, inventory is physical