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Qwestrum Engineering360 · Industrial & Production · Supply Chain Management

Performance Metrics

Supply-chain metrics quantify efficiency, responsiveness, reliability, and financial performance.
Exam tip: keep SI units consistent end-to-end, write the governing relation symbolically before substituting, and sanity-check magnitude and sign.

Key formulas & points

Skim these first — then read the full notes below.

  • SCOR model metrics: reliability, responsiveness
  • Bullwhip effect amplifies demand variability
  • OTIF on-time in-full delivery KPI

Topic details

Introduction

Metrics convert strategy into measurable control loops. Chase and Buffa both emphasize that unbalanced KPIs can create local optimization and global loss.

Key relations & formulas

Formulas (Indian textbook notation)

  • inventoryturnover=COGSaverageinventoryinventory turnover = \frac{COGS}{average} inventory

Formulas (Indian textbook notation)

  • perfectorder=on−time×complete×damage−free×docsperfect order = on-time \times complete \times damage-free \times docs

Formulas (Indian textbook notation)

  • cash−to−cash=DIO+DSO−DPOcash-to-cash = DIO + DSO - DPO

Notation and sign conventions

Relation 1 —
inventoryturnover=COGSaverageinventoryinventory turnover = \frac{COGS}{average} inventory

Formulas (Indian textbook notation)

  • inventoryturnover=COGSaverageinventoryinventory turnover = \frac{COGS}{average} inventory
Write this relation with symbols exactly as in Sunil Chopra Scm — Standard reference before substituting numbers. Examiners award partial marks for a correct setup even when arithmetic slips.
Relation 2 —
perfectorder=on−time×complete×damage−free×docsperfect order = on-time \times complete \times damage-free \times docs

Formulas (Indian textbook notation)

  • perfectorder=on−time×complete×damage−free×docsperfect order = on-time \times complete \times damage-free \times docs
Write this relation with symbols exactly as in Sunil Chopra Scm — Standard reference before substituting numbers. Examiners award partial marks for a correct setup even when arithmetic slips.
Relation 3 —
cash−to−cash=DIO+DSO−DPOcash-to-cash = DIO + DSO - DPO

Formulas (Indian textbook notation)

  • cash−to−cash=DIO+DSO−DPOcash-to-cash = DIO + DSO - DPO
Write this relation with symbols exactly as in Sunil Chopra Scm — Standard reference before substituting numbers. Examiners award partial marks for a correct setup even when arithmetic slips.

Concept in depth

Inventory turnover indicates flow efficiency, cash-to-cash captures working capital cycle, and perfect order measures customer-facing execution quality. KPI sets should include service, cost, asset, and process stability dimensions. Groover-inspired manufacturing integration ties these metrics to shop-floor decisions.

Assumptions and validity limits

State assumptions explicitly before using any relation for performance metrics — steady state, uniform properties, linear elastic material, ideal gas, incompressible flow, etc., as applicable.
Wrong assumptions invalidate the entire solution even when the formula is correct. In Supply Chain viva and GATE descriptive questions, listing valid assumptions often earns separate marks.

Step-by-step problem approach

1. Read the question and list given data with SI units (common in Supply Chain papers).
2. Draw a neat labelled diagram where applicable — examiners in Indian universities award diagram marks even when arithmetic slips.
3. Identify which relation from this topic applies to performance metrics.
4. Use equation 1:
inventoryturnover=COGSaverageinventoryinventory turnover = \frac{COGS}{average} inventory
.
5. Use equation 2:
perfectorder=on−time×complete×damage−free×docsperfect order = on-time \times complete \times damage-free \times docs
.
6. Substitute values, compute, and verify units and sign (direction).
7. State conclusion in one line — e.g. safe/unsafe, stable/unstable, feasible/infeasible.

Applications & exam relevance

Performance Metrics appears in FMCG and manufacturing. In Indian industrial curricula this topic is tested because it connects theory to procurement, logistics, and networks.
GATE and semester exams often combine performance metrics with earlier units — revise prerequisites before attempting mixed problems.
Industry interview panels sometimes ask: "Where did you use performance metrics?" — answer with a lab, mini-project, or plant visit example if possible.

Common mistakes in exams

Common mistakes include mixing day-based and annual metrics in cash-cycle calculations. Students also multiply perfect-order factors without converting percentages to decimal form.

Quick revision checklist

Before attempting performance metrics problems, confirm you can:
1. SCOR model metrics: reliability, responsiveness
2. Bullwhip effect amplifies demand variability
3. OTIF on-time in-full delivery KPI
Revise the solved examples in Sunil Chopra Scm — Standard reference and one previous-year GATE or university paper for this unit.

Worked examples

Try the problem first — open the solution when you are ready to check.

Cash-to-cash cycle

Problem

Given DIO=52 days, DSO=38 days, DPO=44 days, compute cash-to-cash.

Solution

Cash-to-cash = 52 + 38 - 44 = 46 days.

Conceptual check — Performance Metrics

Problem

In a Supply Chain semester or GATE paper you are asked: "State the main assumption, the governing relation, and one practical consequence of performance metrics." What should a complete answer include?

📖 Standard books (India)

  • Sunil Chopra Scm — Standard reference

    Read: Syllabus unit

    Referenced in Indian B.Tech syllabus

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