Cost and Management Accounting · Material Cost

ABC, VED and Other Inventory Classification Methods Explained

Updated 4 October 2026 · Fact-checked

ABC, VED, FSN, HML and SDE are selective inventory control methods. They group items by value, criticality, movement, unit price or availability so management spends effort where it matters. For ABC numericals, rank items by annual usage value, compute cumulative percentages, then assign A, B and C classes.

Understand ABC, VED and Other Inventory Classification Methods

A business may hold thousands of stock items. Watching every item equally is costly and pointless. Selective control means you classify items and give close control only to the few that need it, and light control to the rest.

The ABC analysis classifies items by annual consumption value. ("Always Better Control" is only an informal mnemonic for remembering it, not a definition.) A few items (A) account for most of the value, so they get tight control. Many items (C) account for little value, so they get simple control. B items sit in between. A common pattern is A: about 10% of items and about 70% of value, B: about 20% of items and about 20% of value, C: about 70% of items and about 10% of value. These are typical figures, not fixed rules. In the exam, use the limits given in the question.

Other methods use a different basis. VED (Vital, Essential, Desirable) classifies by criticality: a stock-out of a vital item halts production, an essential item causes a loss but can be managed, a desirable item has no immediate effect. It is common for spare parts. FSN (Fast, Slow, Non-moving) uses the rate of issue. HML (High, Medium, Low) uses unit price. SDE (Scarce, Difficult, Easy) uses how hard the item is to procure. XYZ analysis is a different method: it classifies items by the value of stock on hand (closing stock), whereas ABC uses annual consumption value.

Selective control works with record keeping. A bin card is kept by the storekeeper at the bin and shows quantities only: receipts, issues and balance. The stores ledger is kept by the costing department and shows quantities and values. Under perpetual inventory, records show the balance after every transaction, and continuous stock taking means a few items are physically checked every day through the year, so production need not stop for a full count.

Key rules to remember

Annual usage value: Annual usage value = Annual consumption (units) × Unit price; This is the ranking base for ABC analysis.
Cumulative percentage: Cumulative % of value = Running total of usage value ÷ Total usage value × 100; Compute the same for cumulative % of items (items counted ÷ total items × 100).
Perpetual inventory balance: Closing balance = Opening balance + Receipts − Issues; Bin card shows this in quantity. Stores ledger shows it in quantity and value.
Stock discrepancy: Discrepancy = Physical stock − Book (bin card / ledger) stock; Found by continuous stock taking. Positive is excess, negative is shortage. Investigate and adjust.
Classification bases: ABC: value | VED: criticality | FSN: movement | HML: unit price | SDE: availability; Memorise the base. Questions often ask which method suits a given situation.

How to solve ABC, VED and Other Inventory Classification Methods questions

Use this for ABC numericals and for theory questions on other methods.

1Read what is asked: a numerical classification, a comparison, or a method choice for a situation.
2For ABC, compute annual usage value for each item as units × price.
3Rank items in descending order of usage value and compute total value.
4Compute each item's percentage of total units or items, and of total value, then the cumulative percentages.
5Assign classes using the given limits. If none are given, apply the typical split and say so.
6Summarise in a table with class, number of items, % of items, value and % of value.
7Add a short interpretation: A gets tight control, accurate records and frequent review; C gets simple control and bulk ordering.
8For theory, name the base, define each category, and give one example each.

Quickest way: Rank, accumulate, cut

When to use it: Use for any ABC numerical under time pressure.

Compute usage value for every item first. Add them up and check the total once.
Sort by value, largest first. Write item numbers beside the values to avoid mixing up.
Add running totals and convert to cumulative % of total. A short ratio check helps.
Draw the A, B, C cut at the limits using the rule the question gives for the item that crosses a limit (include it or leave it out), and write the summary table. If the question is silent, state the rule you use.
For MCQs, remember the base of each method. Spare parts with serious stoppage risk point to VED. Fast or slow issue points to FSN. Scarcity of supply points to SDE. Unit price points to HML.
In written answers, show working, table and a two-line interpretation to earn step marks.

Common mistakes in ABC, VED and Other Inventory Classification Methods

Ranking items by unit price or by units instead of usage value.
Students sort the data as it is given.
Fix: Always multiply units by price first and rank on the product.
Using cumulative % of items without ranking first.
The table is built in the question order.
Fix: Sort in descending value before any cumulative column.
Treating 70-20-10 as a fixed rule.
It is memorised as a law.
Fix: Use limits given in the question. The typical split applies only when the question is silent.
Confusing ABC with VED.
Both give three classes.
Fix: ABC is about money value. VED is about how critical the item is. A cheap item can be Vital.
Saying the bin card records values.
Bin card and stores ledger look alike.
Fix: The bin card has quantities only and the stores ledger has quantities and values.
Calling perpetual inventory and continuous stock taking the same thing.
They are taught together.
Fix: Perpetual inventory is the record of running balances. Continuous stock taking is the physical checking of those records throughout the year.

Worked examples

Example 1

A firm has six items. Item, annual units, unit price: P 1,000 units at ₹50; Q 2,000 at ₹10; R 200 at ₹250; S 500 at ₹20; T 100 at ₹40; U 400 at ₹100. Classify them as A, B and C. Class A is the items whose cumulative value stays up to 70% of the total, B the further items whose cumulative value stays up to 90%, and C the rest. An item that would take the cumulative value above a limit goes to the next class.

Show the solution

Usage values: P = 1,000 × 50 = ₹50,000. Q = 2,000 × 10 = ₹20,000. R = 200 × 250 = ₹50,000. S = 500 × 20 = ₹10,000. T = 100 × 40 = ₹4,000. U = 400 × 100 = ₹40,000.
Total = 50,000 + 20,000 + 50,000 + 10,000 + 4,000 + 40,000 = ₹1,74,000.
Rank: P ₹50,000, R ₹50,000, U ₹40,000, Q ₹20,000, S ₹10,000, T ₹4,000. P and R tie at ₹50,000, so their order is arbitrary. Either order gives the same classification, because both fall in class A.
Cumulative value and %: P 50,000 = 28.74%. R 1,00,000 = 57.47%. U 1,40,000 = 80.46%. Q 1,60,000 = 91.95%. S 1,70,000 = 97.70%. T 1,74,000 = 100%.
Cut for A (limit 70%): P (28.74%) and R (57.47%) stay within 70%. U would take the cumulative to 80.46%, which is above 70%, so U is not in A. Class A = P, R.
Cut for B (limit 90%): U takes the cumulative to 80.46%, within 90%, so U is in B. Q would take it to 91.95%, above 90%, so Q is not in B. Class B = U.
Class C is the rest: Q, S and T.
Summary: A has 2 items (33.33% of items) and ₹1,00,000 (57.47% of value). B has 1 item (16.67%) and ₹40,000 (22.99%). C has 3 items (50%) and ₹34,000 (19.54%). The shares differ from 70/20/10 because there are only six items and each item is a large share of the total.
Note on convention: if the question instead says to include the item that crosses each limit, U joins class A and Q joins class B. Always follow the rule stated in the question.

Answer: Class A: P, R. Class B: U. Class C: Q, S, T. Class A holds ₹1,00,000 (about 57.5%) of the ₹1,74,000 total from 2 of the 6 items, so it needs the tightest control.

Example 2

Distinguish between ABC analysis and VED analysis, and state which method suits control of spare parts for critical machines.

Show the solution

Basis: ABC uses annual consumption value. VED uses criticality of the item to production.
Categories: ABC has A (high value), B (moderate value), C (low value). VED has Vital (stock-out stops production), Essential (stock-out causes loss but can be managed), Desirable (stock-out has no immediate effect).
Focus: ABC controls investment in stock. VED controls the risk of a stock-out.
Typical use: ABC suits raw materials and general stores. VED is mostly used for spare parts and consumables.
Limitation: a cheap item may be class C in ABC but Vital in VED, so the two are often used together.
Conclusion: for spare parts of critical machines, the question is about the effect of a shortage, not value, so VED fits best.

Answer: ABC ranks items by money value and VED ranks them by criticality. For spare parts of critical machines, VED analysis is the more suitable method.

Exam tips

In ABC numericals, show the usage value working, the ranked table and the cumulative % columns. Each earns step marks.
State the class limits you use, especially if the question gives none.
For MCQs, link each method to its base: value, criticality, movement, unit price, availability.
Write theory comparisons in point form with basis, categories, focus and use.
Remember the bin card versus stores ledger difference. Quantity-only versus quantity and value is a favourite short question.

Practice questions from Material Cost

ABC, VED and Other Inventory Classification Methods in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

CMA IntermediateInventory Control Techniques (ABC, VED, FSN)

ABC, VED and Other Inventory Classification Methods: frequently asked questions

What is the difference between ABC and VED analysis?

ABC classifies items by annual usage value. VED classifies them by how critical they are to production. A low-value item can be Vital in VED while being class C in ABC.

What is the difference between perpetual inventory and continuous stock taking?

Perpetual inventory is the system of recording receipts and issues so the balance is known after every transaction. Continuous stock taking is the physical verification of selected items throughout the year to check those records.

What do FSN, HML and SDE analysis mean?

FSN classifies items as Fast, Slow or Non-moving by rate of issue. HML classifies items as High, Medium or Low by unit price. SDE classifies items as Scarce, Difficult or Easy by how hard they are to procure.

How does a bin card differ from a stores ledger?

The bin card is kept by the storekeeper and records quantities only. The stores ledger is kept in the costing department and records both quantities and values.