Companies calculate and keep safety stocks as part of their overall inventory management as a matter of best practice. The science is not new; almost every commercial supply chain planning software enables at least one version of safety stock calculation. There is a range of methodologies available out there, based on:
- Period coverage (backward or forward)
- Normal distribution
- Bootstrapping
- Optimization-based (linear programming) methods
Over the years, I have had doubts and questions about these methods. Lately, I have also been fielding questions on safety stocks on LinkedIn. Some of these questions are similar to ones I have had over the years; others can lead to a lot of head-scratching. Here is a sampling of questions about safety stock, some from recent times and some from the past:
- I have always used 3 periods of demand as my safety stock. What is wrong with that?
- You probably have too much safety stock.
- My customer gives me a long lead time on their orders. How best to account for this in the safety stock calculations?
- Lucky you! You may need less safety stock.
- My supply is not always reliable – I do not always get what I order. How best to account for this in my safety stock calculation?
- My suppliers have quality issues. On average, only 90% of the product received is usable. Should I account for this in my safety stock?
- I have heard about the cycle service level and the fill rate service level. Which should I use? (more on this here)
Register today and join me on Wednesday, November 9, 2022, at 11 am ET for our latest webinar “How to Calculate Safety Stock: Pros and Cons of Different Methods” where I will discuss the pros and cons of these various methods. Attendees will walk away more informed about how to approach the question of setting safety stock in their business.
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- Source: https://blog.arkieva.com/5-questions-about-safety-stock-calculations/
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