Demand planners shouldn't do this

Demand planners are not computers.
So don't ask them to do what computers should do.
They shouldn't spend a minute finetuning or selecting forecasting models.
Let an algorithm do this. It will be faster and more reliable.
I don't clean outliers, and so should you;
If you have outliers,
- Invest more time in (automated) data cleaning and processing.
- Include more business drivers in your forecasting engine (promotions, shortages, price changes)
- If you really have some exceptional periods (covid), bypass them - don't correct them.
Finally, if your demand planners worry (or track) about current and future shortages, it means that you are forecasting sales and not demand. This will result in a vicious circle: shortages will lead to 0 forecasts, which will lead to 0 supply orders, resulting in more shortages!
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