Project Planning, Estimation, and Engineering Economics
Planning under uncertainty
Why estimation matters
Engineering projects rarely start with perfect information. Estimates help teams budget time, money, materials, and labor while acknowledging uncertainty and risk.
Common project terms
Engineering economics
Economic decision-making compares initial cost, operating cost, maintenance, lifetime, and performance. The cheapest upfront option is not always the lowest-cost option over the full life cycle.
Think in life-cycle cost
A more durable design may cost more at first but save money through lower maintenance, downtime, and replacement frequency.
Practical estimation method
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Step 1: Break the project into small tasks.
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Step 2: Estimate each task separately.
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Step 3: Add contingency for uncertainty.
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Step 4: Track actual progress against the plan.
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Step 5: Update estimates when new information appears.
Why is life-cycle cost important?
Life-cycle cost includes purchase, operation, maintenance, and replacement costs.
Correct answer: It compares total cost over the full useful life
What does contingency in a plan help cover?
Contingency provides buffer for unexpected time or cost overruns.
Correct answer: uncertainty
Which is the best reason to break a project into smaller tasks?
Smaller tasks are easier to estimate, assign, and monitor.
Correct answer: It improves estimation and management