Inventory management using Kanban

Kanban is a “magical” inventory management system. It requires no databases and no gadgets. Yet, it allows organizations with a lot of parts to manage them almost without much planning. It is very useful and I am recommending it every time it fits.
This post is all about the Kanban system, with examples and recipes on how to make it works.
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Right first time: Using SPC to improve RFT

Starting production with the right parameters with low scrap and almost no time consumption is important for production efficiency.
RFT=right first time
RFT is a challenging task for most production organizations that produces many products/parts.
Using SPC is a good way to solve problems regarding RFT.
How can we find the parameter that we can improve, out of hundreds of products and dozens of parameters that each product has in its spec?