--- title: "ABC classification and material management" subject: "Construction Management" chapter: 3 key: "semester_8/construction_management:abc-importance-material-mgmt" source: https://www.bctengineer.com/q/semester_8/construction_management/abc-importance-material-mgmt site: BCT Engineering --- # ABC classification and material management Construction Management · Chapter 3: Planning Construction Material - Asked in: 2074 Bhadra, 5 marks; 2070 Bhadra, 4 marks (asked 2 times) - Video: [ABC ANALYSIS II MATERIAL MANAGEMENT II PROJECT MANAGEMENT II EXAMPLE](https://www.youtube.com/watch?v=Z82Gry4hxEo) — PM Home Tuitions - Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14 - Page: https://www.bctengineer.com/q/semester_8/construction_management/abc-importance-material-mgmt - Whole chapter: https://www.bctengineer.com/md/semester_8/construction_management/chapter-3 ## Question What do you mean by ABC classification of materials? Discuss the importance of material management. ## Short answer ABC classification divides materials into A (10-20% items, 70-80% value), B (30%, 15-20%), and C (50-60%, 5-10%) based on annual consumption value. Material management is vital because materials account for 50-60% of project cost; proper control ensures timely availability, reduces inventory cost, prevents wastage, and improves cash flow. ## Answer #### ABC classification ABC classification is an inventory control technique that divides materials into three classes according to their annual consumption value (quantity x unit rate), based on the Pareto (80-20) principle. | Class | Share of items | Share of annual value | Control | |---|---|---|---| | A | About 10-20% | About 70-80% | Very tight: frequent review, accurate records, close supplier follow-up, small safety stock | | B | About 30% | About 15-20% | Moderate control, periodic review | | C | About 50-60% | About 5-10% | Simple control, bulk order, large safety stock | Typical A items: cement, steel, bitumen; B: bricks, aggregates, tiles; C: nails, binding wire, paint brushes. #### Importance of material management Materials form about 50-60% of the total cost of a building project, so their management is critical. 1. **Cost control:** buying at the right price, in correct quantity, avoids waste and overstocking. 2. **Continuous work:** materials available on time avoid idle labour and equipment and keep the schedule. 3. **Reduced inventory cost:** holding costs, damage and theft are lower. 4. **Quality assurance:** inspected materials as per specification. 5. **Less wastage and pilferage** through proper storage, issue and records. 6. **Better cash flow:** capital is not locked in stock. 7. **Reliable estimates and records** for cost accounting and future projects. ## Check yourself The answer's key points as multiple-choice questions, with the correct option and why. 1. ABC classification classes materials by: A. annual consumption value (quantity x rate) B. weight C. delivery time D. supplier name Answer: A. It uses annual consumption value, following the Pareto 80-20 principle. (Key point: Basis of ABC) 2. Class A items are typically: A. 50-60% of items, 5-10% of value B. 30% of items, 15-20% of value C. 10-20% of items, 70-80% of value, tightly controlled D. all small items like nails Answer: C. A items are few but carry most of the value, so they need tight control. (Key point: Class A features) 3. Why is material management critical in a building project? A. Materials are about 50-60% of project cost B. Materials are negligible in cost C. It only affects labour D. It is needed only for tax Answer: A. Since materials form a large share of cost, good control saves cost, avoids idle time and reduces wastage. 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