When we picked up Toyota's lean practices for use in software development, we underestimated the differences between manufacturing assembly line (hereafter "the line") and software development. I have made an effort to list some of these here and emphasize why we should be cautious while choosing lean manufacturing practices into software development.
1. The line doesn't have any slack. You can't play AoE when the line is moving with units that need you to perform a task. By contrast, software development is asynchronous.
2. Work performed at different stages of the line are very small and always take the same effort - because work is done on a line that is moving. By contrast, work performed at different stages of software development runs into hours / days and varies based on the nature of the story in question
3. Stories though independent, are part of the whole (system). They can't exist independently nor be sold independent of the overall software system, unlike units manufactured on the line.
4. Chaman pointed out that software development is iterative in contrast to manufacturing.
5. The equivalent of software development in manufacturing is probably Product Research & Development (R&D) rather than the line itself.
I am sure there are many more differences. That said, we could as easily build a list of similarities. They key point is to be cognizant of the differences, and ensure we are cautious when choosing and implementing lean manufacturing practices in the software development context.
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