Financial Management and Business Data Analytics · Inventory Management

ABC, VED and FSN Inventory Control Techniques

Updated 10 October 2026 · Fact-checked

Inventory control techniques focus effort where it matters. ABC ranks items by annual consumption value, VED by criticality, FSN by movement speed. To solve an ABC numerical, compute value for each item, rank in descending order, work out cumulative percentages, then assign A, B and C classes. The two-bin system, JIT and perpetual inventory support control.

Understand Inventory Control Techniques (ABC, VED, FSN)

A firm may hold hundreds or thousands of items. Giving every item the same attention wastes time and money. Selective control means you spend the most effort on the items that matter most, and use simple routines for the rest.

ABC analysis classifies items by the value of annual consumption (quantity used × unit cost). A items are few in number but high in value, so they get tight control, frequent reviews and low safety stock. B items get moderate control. C items are many in number but low in value, so they get simple control and larger stocks. A common rule of thumb is that A is roughly 10-20% of items and 70-80% of value. This is only a guide, not a fixed law. Use the cut-offs the question gives.

VED analysis classifies by criticality, mainly for spares. Vital items stop production if they are missing, so you keep safe stock. Essential items are needed, but a short delay can be managed. Desirable items do not affect production much, and a shortage causes little harm. VED looks at importance, not value. A cheap part can be Vital.

FSN analysis classifies by movement. Fast-moving items are used often. Slow-moving items are used rarely. Non-moving items have had no issue for a long period, so you review them for disposal. It helps you spot obsolete stock and cut carrying costs.

The two-bin system keeps stock in two bins. You issue from the first bin. When it is empty, you place an order, and use the second bin, which holds stock for the lead time plus a safety margin. Perpetual inventory is a system of continuous stock records, backed by continuous stock verification, so book balances can be checked against physical stock throughout the year. Just-in-time (JIT) means materials arrive only when needed for production. It reduces storage cost, handling cost and the investment in stock. It needs reliable suppliers, good quality and stable demand.

Key rules to remember

Annual consumption value: Annual consumption value = Annual usage (units) × Unit cost (₹); The base for ranking in ABC analysis.
Cumulative percentage: Cumulative % of value = Running total of value ÷ Total value × 100; Rank items in descending order of value first. Do the same for cumulative % of items.
ABC classes (typical guide): A: few items, high value | B: moderate items, moderate value | C: many items, low value; Percentages vary. Use the question's cut-offs if given.
VED and FSN bases: VED = criticality | FSN = rate of movement or issue; Neither depends on the value of the item.
Two-bin trigger: Second bin quantity = Consumption during lead time + Safety stock; Reordering is triggered when the first bin is empty.

How to solve Inventory Control Techniques (ABC, VED, FSN) questions

Use this order for any ABC numerical or theory question on selective control.

1Read the basis: value (ABC), criticality (VED) or movement (FSN). Do not mix them.
2For ABC, compute annual consumption value for each item: units × unit cost.
3Add all values to get the total. Rank items in descending order of value.
4Compute each item's percentage of total items and of total value, then the cumulative percentages.
5Draw class boundaries using the question's cut-offs, or where the cumulative value rises steeply and then flattens.
6Prepare a summary table: class, item numbers, number of items, % of items, value, % of value.
7Add one line of control policy for each class, such as tight control for A and simple control for C.
8For theory, give the meaning, basis, use and a limitation. Name the two-bin, JIT or perpetual system if asked.

Quickest way: Rank, accumulate, cut

When to use it: For ABC numericals with 6-12 items and a 15-20 minute window.

Compute value per item in one column and total it.
Sort by value in descending order. Rewrite the list once, neatly.
Write cumulative value % beside each item.
Mark the cut where cumulative value reaches about 70-80% (A) and about 90-95% (B), unless given otherwise.
Fill the summary table. Check that items and values add to 100%.

Common mistakes in Inventory Control Techniques (ABC, VED, FSN)

Ranking items by unit price or by quantity instead of annual consumption value.
Students sort the data in the order it is given or pick the easiest column.
Fix: Always multiply units by unit cost first. Rank only on that product.
Calculating cumulative percentages without sorting first.
Students rush to save time.
Fix: Sort in descending order of value before adding. A cumulative total is meaningless otherwise.
Treating the 70-80% and 10-20% split as a fixed rule.
The rule of thumb is memorised as a law.
Fix: Use the question's cut-offs. If none are given, state your assumption and place the breaks where the curve flattens.
Confusing VED with ABC by assuming Vital items are high value.
Both use three classes and the labels seem similar.
Fix: Remember that ABC is about money and VED is about importance to operations. A low-cost part can be Vital.
Writing FSN as based on value or on criticality.
Students mix the three selective techniques.
Fix: Link F, S and N to the rate of issue. Non-moving items are candidates for disposal.
Presenting JIT as having no risks.
Only the advantages are memorised.
Fix: State the advantages, then add the dependence on suppliers and the risk of production stoppage if a delivery is late.

Worked examples

Example 1

A firm uses six items. Annual usage and unit cost: P 2,000 units at ₹50; Q 500 units at ₹40; R 100 units at ₹300; S 4,000 units at ₹2; T 200 units at ₹25; U 50 units at ₹100. Classify them using ABC analysis. Take A as items covering about the first 70% of value, B as the next 20%, and C as the rest. Assume an item belongs to A until cumulative value first reaches or exceeds 70%, and to B until cumulative value first reaches or exceeds 90%.

Show the solution

Annual values: P = 2,000 × 50 = ₹1,00,000. Q = 500 × 40 = ₹20,000. R = 100 × 300 = ₹30,000. S = 4,000 × 2 = ₹8,000. T = 200 × 25 = ₹5,000. U = 50 × 100 = ₹5,000.
Total value = 1,00,000 + 20,000 + 30,000 + 8,000 + 5,000 + 5,000 = ₹1,68,000.
Rank in descending order: P ₹1,00,000; R ₹30,000; Q ₹20,000; S ₹8,000; T ₹5,000; U ₹5,000.
Cumulative value: P 1,00,000 (59.5%); R 1,30,000 (77.4%); Q 1,50,000 (89.3%); S 1,58,000 (94.0%); T 1,63,000 (97.0%); U 1,68,000 (100%).
A: P is at 59.5%, below 70%, so it is A. R takes the cumulative to 77.4%, which first reaches or exceeds 70%, so R is the last A item. A = P and R.
B: Q takes the cumulative to 89.3%, still below 90%, so Q is B. S takes it to 94.0%, which first reaches or exceeds 90%, so S is the last B item. B = Q and S.
C: the remaining items T and U are C.
Summary (percentages rounded): A = P, R (2 items, 33.3% of items, ₹1,30,000, 77.4% of value). B = Q, S (2 items, 33.3%, ₹28,000, 16.7%). C = T, U (2 items, 33.3%, ₹10,000, 6.0%). Items total 6 and value totals ₹1,68,000.

Answer: A: P and R. B: Q and S. C: T and U. Apply tight control to P and R, moderate control to Q and S, and simple control to T and U.

Example 2

A manufacturer stocks machine spares. Explain how it would use VED and FSN analysis together, and why it might also adopt the two-bin system for low-value items.

Show the solution

VED sets importance. Vital spares, for example a bearing whose failure stops a line, must always be in stock, even if they rarely move.
Essential spares are kept at reasonable levels. Desirable spares are bought when needed.
FSN sets movement. Fast-moving spares are reordered regularly. Slow-moving spares are reviewed for stock levels. Non-moving spares are reviewed for disposal.
Combine them: a Vital and Slow-moving spare is held despite low usage. A Desirable and Non-moving spare is a clear candidate for disposal.
Two-bin: for low-value items such as nuts and bolts, keep two bins. Issue from the first bin. When it is empty, place an order and use the second bin, which covers lead-time usage plus a safety margin.
This needs no detailed ledger entries for every issue, so clerical cost is low and control is still adequate.

Answer: VED guards against stoppage, FSN controls carrying cost and obsolescence, and the two-bin system gives simple, low-cost reordering for cheap items.

Exam tips

In ABC numericals, show the value column, the sorted list, the cumulative percentages and the summary table. Each earns step marks.
State your class boundaries clearly if the question gives none, and say that they are assumptions.
For 'difference between ABC and VED', use three points: basis (value vs criticality), main use (all stores vs spares) and focus (cost control vs availability).
MCQs often match each technique to its basis: ABC to value, VED to criticality, FSN to movement, JIT to materials arriving only when needed. There is no negative marking, so attempt every one.
In JIT answers, give advantages and the conditions it needs. This balance is what examiners reward.

Practice questions from Inventory Management

Inventory Control Techniques (ABC, VED, FSN) in other exams

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

CA IntermediateInventory Control Techniques: ABC, VED, FSN, JIT

Inventory Control Techniques (ABC, VED, FSN): frequently asked questions

What is the difference between ABC and VED analysis?

ABC classifies items by the value of annual consumption, so it controls money tied up in stock. VED classifies items by how critical they are to operations, so it protects against stoppage. A low-value item can be Vital, and a high-value item can be Desirable.

How do I do an ABC analysis numerical?

Compute annual consumption value for each item, rank by value in descending order, find cumulative percentages and assign A, B and C using the given cut-offs. Then give a summary table with number of items and value in each class.

What are the advantages of just-in-time inventory management?

JIT reduces stock holding and storage cost, frees working capital, lowers obsolescence and wastage, and encourages quality and good supplier relations. It needs reliable suppliers and stable demand, and a delayed delivery can stop production.

What is perpetual inventory?

It is a system in which stock records are updated continuously and physical stock is checked against them throughout the year. This allows discrepancies to be found early, and avoids shutting down for a single annual stocktaking.