https://www.ibm.com/developerworks/community/blogs/ambler/entry/principles_lean_software_development?lang=en http://www.forbes.com/2010/01/11/software-lean-manufacturing-technology-cio-network-agile.html http://www.hackerchick.com/2012/01/agile-vs-lean-yeah-yeah-whats-the-difference.html https://en.wikipedia.org/wiki/Lean_software_development#Decide_as_late_as_possible
http://www.101ways.com/7-key-principles-of-lean-software-development-2/