innerbuilding blocks

Translation of lean manufacturing principles and practices to the software development domain. Adapted from the Toyota Production System, it is emerging with the support of a pro-lean subculture within the agile community. Lean offers a solid conceptual framework, values and principles, as well as good practices, derived from experience, that support agileThe term lean software development originated in a book by the same name, written by Mary Poppendieck and Tom Poppendieck in 2003. The book restates traditional lean principles, as well as a set of 22 tools and compares the tools to corresponding agile practices. The Poppendiecks' involvement in the agile software development community, including talks at several Agile conferences has resulted in such concepts being more widely accepted within the agile community.
In order to eliminate waste, one should be able to recognize it. If some activity could be bypassed or the result could be achieved without it, it is waste. Partially done coding eventually abandoned during the development process is waste. Extra features like paperwork and features not often used by customers are waste. Switching people between tasks is waste. Waiting for other activities, teams, processes is waste. Relearning requirements to complete work is waste. Defects and lower quality are waste. Managerial overhead not producing real value is waste.

A value stream mapping technique is used to identify waste. The second step is to point out sources of waste and to Book agile lean them. Waste-removal should take place iteratively until even seemingly essential processes and procedures are liquidated.
Software development is a continuous learning process based on iterations when writing code. Software design is a problem-solving process involving the developers writing the code and what they have learned. Software value is measured in fitness for use and not in conformance to requirements.