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Financial Management and Strategic Management · Management of Inventory

Inventory Control Techniques: ABC, VED, FSN, JIT

Updated 4 October 2026 · Fact-checked

Inventory control techniques decide how closely you watch each stock item. ABC classifies by value, VED by criticality, FSN by movement speed. JIT cuts stock by buying only when needed. To solve questions, rank items, compute cumulative percentages, assign classes, and state the control policy for each class.

Understand Inventory Control Techniques: ABC, VED, FSN, JIT

Inventory is money tied up in stock. A firm holds hundreds of items, but it cannot watch every item equally. Control techniques tell you where to spend management effort and where simple rules are enough.

ABC analysis sorts items by annual consumption value (units × price). A few items, class A, carry most of the value and get tight control. Class B gets moderate control. Class C, many items with small value, gets loose control. ABC analysis is based on the Pareto principle (the 80:20 rule). 'Always better control' is only a mnemonic for remembering it.

VED analysis sorts by criticality, not value. Vital items stop production if missing, so you keep safe stock. Essential items are needed but short delays can be managed. Desirable items do not stop work if short. FSN analysis sorts by movement: Fast-moving, Slow-moving and Non-moving items. It helps you find obsolete stock and cut holding costs. It is usually based on the time since last issue or the rate of issue.

JIT (Just-in-Time) means materials arrive just as production needs them. Stock stays near zero. This needs reliable suppliers, small frequent deliveries, good quality and a stable production schedule. Savings come from lower holding cost, less storage space and less obsolescence. The risk is a stoppage if a delivery fails.

Other systems help in practice. The two-bin system keeps stock in two bins. When the first bin is empty, you reorder and use the second bin, which holds the reorder-level quantity (stock to cover consumption during the lead time, plus any buffer the firm sets). Perpetual inventory keeps records updated after each receipt and issue, with continuous stock verification through the year, so you need no full year-end stoppage.

Key rules to remember

Annual consumption value
Annual consumption value = Annual usage (units) × Unit price
Use this to rank items for ABC analysis. Rank in descending order.
Cumulative percentage for ABC
Cumulative % = Running total of value ÷ Total value × 100
Typical illustration: A about 70% of value from about 10% of items; B about 20% of value from about 20%; C about 10% of value from about 70%. These are indicative, not fixed rules. Follow the figures in the question.
Inventory turnover ratio
Inventory turnover = Cost of goods sold ÷ Average inventory
Average inventory = (Opening + Closing) ÷ 2. If the question gives sales only, state your assumption.
Inventory holding period
Holding period (days) = 365 ÷ Inventory turnover
Use 360 days if the question says so. Equivalent: Average inventory ÷ COGS × 365.
Two-bin system: second bin
Second bin quantity = Reorder level (stock to cover consumption during the lead time, plus any buffer the firm sets)
This is a practical set-up, not a fixed formula. The reorder level is usually worked out as Maximum usage × Maximum reorder period. The first bin holds the rest of the stock.

How to solve Inventory Control Techniques: ABC, VED, FSN, JIT questions

Use this method for any question on inventory control techniques, whether numerical or theory.

  1. 1Identify the technique asked: ABC, VED, FSN, JIT, two-bin, perpetual inventory or turnover ratio.
  2. 2For ABC, compute each item's value as units × price, then rank items from highest to lowest value.
  3. 3Compute each item's share of total value and of total items, then the cumulative percentages. Assign A, B or C using the cut-offs given in the question.
  4. 4For VED and FSN, group items by the criterion stated (criticality or movement). If asked to combine, build a matrix such as ABC–VED and state a policy per cell.
  5. 5For ratios, find COGS and average inventory first, then compute turnover and then holding period.
  6. 6State the control policy: A items need tight control, frequent review and low safety stock. C items need simple rules and bulk ordering.
  7. 7For JIT or theory questions, give meaning, requirements, advantages and limitations in short points.
  8. 8Close with a one-line interpretation, such as what a higher turnover or shorter holding period means.

Quickest way: Rank, cumulate, label

When to use it: Use for ABC numericals and MCQs in limited time.

  1. Compute value for each item and sort at once in descending order.
  2. Add a cumulative column. The first items that reach the A cut-off form class A.
  3. For MCQs, check the total first, then test the options by simple percentages rather than full tables.
  4. Remember: ABC is about value, VED is about criticality, FSN is about movement. Eliminate options that mix these up.
  5. In written answers, draw a small table with item, value, % of total, cumulative % and class. Add one line on control policy to earn the interpretation marks.
  6. For turnover, write the formula first, then substitute. Formula and working earn step marks even if arithmetic slips.

Common mistakes in Inventory Control Techniques: ABC, VED, FSN, JIT

  • Ranking items by unit price or quantity instead of annual consumption value.

    Students see a high price and assume the item is important.

    Fix: Always multiply units by price first. Rank only on that product.

  • Using fixed 70-20-10 cut-offs when the question gives different limits.

    The textbook split is memorised as a rule.

    Fix: Treat the split as indicative. Apply the cut-offs stated in the question. If none are given, say you assume a typical split.

  • Confusing VED with ABC and treating a low-value item as unimportant.

    Both are letter-based classifications.

    Fix: Remember VED measures how badly a stock-out hurts. A cheap vital item still needs safe stock.

  • Using closing inventory instead of average inventory in turnover.

    It saves a step.

    Fix: Use average of opening and closing when both are given. Use closing only if the question gives only one figure, and state this.

  • Saying JIT has no risks or means zero inventory always.

    Advantages are learned and limitations skipped.

    Fix: Write both sides. JIT aims at minimal stock and depends on reliable suppliers. A delivery failure can halt production.

  • Mixing days basis, using 365 in one place and 360 in another.

    Students switch between questions.

    Fix: Use the basis in the question throughout. Default to 365 if nothing is stated.

Worked examples

Example 1

A firm has six items with annual usage and unit price: P: 1,000 units at ₹28; Q: 200 units at ₹200; R: 3,000 units at ₹2; S: 400 units at ₹50; T: 800 units at ₹5; U: 500 units at ₹4. Classify using ABC analysis with these cut-offs: class A = cumulative value up to 70%, class B = above 70% and up to 90%, class C = above 90%. An item is placed in the class in which its cumulative percentage falls.

Show the solution
  1. Values: P = 1,000 × 28 = ₹28,000. Q = 200 × 200 = ₹40,000. R = 3,000 × 2 = ₹6,000. S = 400 × 50 = ₹20,000. T = 800 × 5 = ₹4,000. U = 500 × 4 = ₹2,000.
  2. Total = 28,000 + 40,000 + 6,000 + 20,000 + 4,000 + 2,000 = ₹1,00,000.
  3. Rank: Q ₹40,000 (40%); P ₹28,000 (28%); S ₹20,000 (20%); R ₹6,000 (6%); T ₹4,000 (4%); U ₹2,000 (2%).
  4. Cumulative: Q 40%; P 68%; S 88%; R 94%; T 98%; U 100%.
  5. Q (40%) and P (68%) fall within the 70% limit, so both are class A.
  6. S (88%) is above 70% and within 90%, so S is class B.
  7. R (94%) is above 90%, so R is class C. T (98%) and U (100%) are also class C.
  8. Policy: tight control and frequent review for Q and P. Moderate control for S. Simple periodic control for R, T and U.

Answer: Class A: Q and P (₹68,000, 68% of value from 2 of 6 items). Class B: S (20% of value). Class C: R, T and U (12% of value).

Example 2

A firm's cost of goods sold for the year is ₹36,00,000. Opening inventory is ₹4,00,000 and closing inventory is ₹8,00,000. Calculate inventory turnover ratio and inventory holding period (365 days).

Show the solution
  1. Average inventory = (4,00,000 + 8,00,000) ÷ 2 = ₹6,00,000.
  2. Inventory turnover = 36,00,000 ÷ 6,00,000 = 6 times.
  3. Holding period = 365 ÷ 6 = 60.83 days, about 61 days.
  4. Interpretation: stock is sold and replaced about six times a year, with each unit staying about 61 days. A rising holding period would signal slow-moving stock and higher carrying cost.

Answer: Inventory turnover = 6 times; holding period ≈ 60.8 days (about 61 days).

Exam tips

  • In ABC numericals, show the table with value, percentage and cumulative percentage. Marks go to the working and the final classification.
  • Expect MCQs that ask what a technique is based on. Value means ABC, criticality means VED, movement means FSN.
  • For theory, use short points: meaning, basis, control policy, benefit. Keep JIT answers balanced with advantages and limitations.
  • In ratio questions, say which COGS and inventory figures you used. State any assumption such as 365 days.
  • Do not spend long on a perfect decimal. Two decimal places are enough for percentages.

Practice questions from Management of Inventory

Inventory Control Techniques: ABC, VED, FSN, JIT in other exams

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

Inventory Control Techniques: ABC, VED, FSN, JIT: frequently asked questions

What is the difference between ABC and VED analysis?

ABC classifies items by annual consumption value, so it focuses on money. VED classifies items by how critical they are to production, so it focuses on the damage of a stock-out. A low-value item can be vital, so many firms use both together.

What is FSN analysis with an example?

FSN groups items as fast-moving, slow-moving and non-moving based on how often they are issued. For example, a routine packing material issued daily is fast-moving. A spare part issued twice a year is slow-moving. A part not issued for years is non-moving and may be obsolete.

What are the advantages of JIT inventory management?

JIT reduces holding cost, storage space, obsolescence and the money tied up in stock. It also pushes suppliers and production towards better quality and discipline. It needs reliable suppliers, because a late delivery can stop production.

How do I calculate inventory turnover and holding period?

Inventory turnover is cost of goods sold divided by average inventory. Holding period is 365 days divided by the turnover ratio. A higher turnover and a shorter holding period generally show faster stock movement.

What is the two-bin system?

Stock is kept in two bins. You issue from the first bin, and when it is empty you place a new order and start using the second bin. The second bin holds the reorder-level quantity, which is the stock needed to cover consumption during the lead time, plus any buffer the firm sets.