Inventory · The reorder rules · Element
The safety stock
The buffer held, derived from variability and service level.
The part
What it is
Demand variability and lead-time variability compound. Both are needed, and lead-time variability is the one usually omitted.
Recomputing periodically matters, since demand patterns shift and safety stock set three years ago protects against a former business.
The smallest level
The attributes it carries
Each attribute is one of the framework’s shared types. What a date is, and how it is written, is defined once for the whole model — the note here says what it means in this particular place.
Lead-time variability
The input most often omitted, and frequently the larger one.
Measure shared type