Inventory management is the process of ordering, storing, tracking, and using a business's stock, from supplies and parts to finished goods.
Inventory management is the process of ordering, storing, tracking, and using the stock a business holds - everything from raw materials and spare parts to consumables and finished goods. The aim is balance: enough of every item that work never stops, but not so much that cash sits on shelves going stale. Day to day, that means knowing the current stock level of each item and acting before any of them hits zero.
What counts as inventory
Textbooks split inventory into four types: raw materials, work in progress, finished goods, and MRO stock (maintenance, repair, and operations supplies). For most non-manufacturing businesses, the last category is the whole story - the gloves, fixings, cleaning products, printer toner, and office supplies that keep the place running. The defining trait is that inventory is consumed: quantities go down as items are used or sold, and back up when deliveries arrive. That is what separates it from equipment, which is kept, assigned to someone, and tracked piece by piece.
The basic cycle
However big or small the operation, inventory management is the same loop:
- Order - raise a purchase order with a supplier, ideally triggered by a threshold rather than a memory.
- Receive - check the delivery against the order, then book the quantities into the system before the boxes disappear onto shelves.
- Store and issue - keep items findable, and record usage as stock is taken.
- Count - compare what the system says with what the shelf says, and correct the difference.
- Reorder - and the loop starts again.
Most inventory problems are one of these steps silently not happening - usually step 3, when people take stock without recording it.
Core methods worth knowing
- Reorder points - a per-item stock level that triggers a new order, sized so the delivery arrives before the shelf is empty.
- Safety stock - a deliberate buffer against demand spikes and late deliveries, built into the reorder point.
- FIFO (first in, first out) - use the oldest stock first, essential for anything with a shelf life.
- Cycle counting - counting a small slice of items on a rolling basis instead of shutting down for one annual count, so errors are caught while they are still small.
- Minimum order quantities - the supplier’s smallest sellable batch, which shapes how much you order even when you need less.
Inventory management vs asset management
The two disciplines overlap and are easy to confuse. Inventory is tracked in quantities; nobody cares which box of gloves is which. Assets are tracked as individuals; it matters exactly which laptop the new starter has and what has happened to it. The same storeroom usually holds both - boxed consumables on one shelf, serial-numbered tools on the next - which is why small teams benefit from handling them in one place. AMPthilly treats consumables as their own asset type alongside physical and digital assets, with per-item reorder points, target stock, purchase orders sent as a PDF or emailed to the supplier, and receiving that updates quantities. Whether or not software is involved, the principle holds: count things you consume, register things you keep.
Related terms
- Stock Level - the current quantity of an item, the number the whole discipline revolves around
- Reorder Point - the threshold that turns reordering into a rule instead of a guess
- Safety Stock - the buffer that absorbs late deliveries and busy weeks
- Minimum Order Quantity - the smallest batch a supplier will sell
- Purchase Order - the formal document that starts the replenishment cycle