---
title: "Roles of engineers in economic decisions"
subject: "Engineering Economics"
chapter: 1
key: "semester_6/engineering_economics:roles-of-engineers-economic-decision"
source: https://www.bctengineer.com/q/semester_6/engineering_economics/roles-of-engineers-economic-decision
site: BCT Engineering
---

# Roles of engineers in economic decisions

Engineering Economics · Chapter 1: Introduction

- Asked in: 2070 Magh, 4 marks
- Video: [LECTURE 1 2 The Role of Engineering Economy in the decision making process](https://www.youtube.com/watch?v=psjcqfWmT-U) — LIwanag Florife
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_6/engineering_economics/roles-of-engineers-economic-decision
- Whole chapter: https://www.bctengineer.com/md/semester_6/engineering_economics/chapter-1

## Question

Explain the roles of engineers in making economic decision with appropriate examples.

## Short answer

Engineers develop alternatives, estimate cash flows, apply economic analysis (PW, IRR), select the best option with managers, consider risk and non-monetary factors, control costs, make replacement decisions, and evaluate public projects. They ensure decisions are both technically and economically sound.

## Answer

An engineer's work consumes money, material and time, so engineers take part in nearly every economic decision of an organisation. Their roles are:

1. **Developing and defining alternatives.** The engineer generates technically feasible options and estimates their cost and performance. Example: for a village water supply, options are gravity flow, pumping from a borehole, or a lift scheme.
2. **Estimating cash flows.** Engineers estimate initial investment, operating and maintenance cost, benefits, salvage value and life. Example: a mechanical engineer estimates the capital cost, power consumption and life of a new pump.
3. **Applying economic analysis.** Using PW, AW, IRR, B/C ratio and break-even tools to rank alternatives. Example: comparing two machines of different cost and life by annual worth.
4. **Choosing the best alternative with managers.** The engineer recommends the option that gives the best return within technical and budget limits, e.g. to buy or to lease a generator.
5. **Considering risk and non-monetary factors.** Safety, environment, reliability and uncertainty in estimates are analysed by sensitivity analysis. Example: effect of a 20% cost overrun on a bridge project.
6. **Cost control and project monitoring.** Comparing actual cost with budget or standard, finding variances, and taking corrective action.
7. **Replacement and maintenance decisions.** Deciding whether to repair or replace ageing equipment such as a transformer or a bulldozer.
8. **Pricing and production planning.** Break-even analysis for deciding the production level of a product.
9. **Public-sector evaluation.** Calculating benefit-cost ratio of roads or hydropower schemes.

Good engineering decisions therefore need both technical skill and economic judgment.

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. For a village water supply, the engineer's first economic role is to:
   A. Choose the cheapest without comparing
   B. Only prepare drawings
   C. Fix the tariff
   D. Develop technically feasible options such as gravity, borehole pumping or lift
   Answer: D. Engineers generate and define alternatives. (Key point: Role in alternatives)

2. Which are cash flows an engineer estimates?
   A. Initial investment, O&M cost, benefits, salvage value and life
   B. Only the purchase price
   C. Only benefits
   D. Only the interest rate set by the bank
   Answer: A. All cash flows over the life are needed. (Key point: Cash flow estimation)

3. Effect of a 20% cost overrun on a bridge is studied by:
   A. Depreciation
   B. Sensitivity analysis
   C. Market research
   D. Break-even analysis
   Answer: B. Sensitivity analysis shows effect of changed estimates. (Key point: Risk)

4. Cost control and monitoring means:
   A. Raising the budget each time
   B. Estimating future cost only
   C. Comparing actual cost with budget, finding variances and taking corrective action
   D. Ignoring variances
   Answer: C. Variances reveal where to correct. (Key point: Cost control)

## Related in Engineering Economics

- [Principles of engineering economics and decision making](https://www.bctengineer.com/question.md?key=semester_6%2Fengineering_economics%3Aprinciples-ee-help-decision) — Engineering Economics, chapter 1

## Related in other subjects

- [IS supports managers in decision making](https://www.bctengineer.com/question.md?key=semester_8%2Finformation_system%3Ais-supports-decision-making-quality) — Information System, chapter 1
- [Switch statement in decision making](https://www.bctengineer.com/question.md?key=semester_1%2Fcomputer_programming%3Aswitch-decision-making) — Computer Programming, chapter 5
- [Decision making levels and stages](https://www.bctengineer.com/question.md?key=semester_8%2Fconstruction_management%3Adecision-making-levels) — Construction Management, chapter 10
- [Importance of society to engineers](https://www.bctengineer.com/question.md?key=semester_8%2Fengineering_professional_practice%3Aman-society-importance-engineer) — Engineering Professional Practice, chapter 1, asked 2×