Value engineering and value analysis

Value as function over cost, types of value, basic and secondary functions, worth and value index, FAST diagrams and the value engineering job plan, with savings and payback.

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Why it matters

Customers pay for what a product does, not for its parts. Value engineering asks, for every part and feature, "what function does this perform, and what is the cheapest reliable way to perform it?" Indian manufacturers in automobiles, appliances and capital goods use it routinely to remove 10–30% of cost without losing performance, so it is a favourite interview topic for production engineers.

Key ideas

Value. The ratio of the function (or performance, utility) a product provides to its cost. Value rises if function increases at the same cost, cost falls for the same function, or function rises faster than cost. Lowering cost by cutting a required function is not value improvement.

Kinds of value.

  • Use value — the properties that make the product perform its function.
  • Esteem value — properties that make it desirable to own (appearance, brand, finish).
  • Cost value — the total cost to produce it.
  • Exchange value — what it can be traded or sold for.

Value engineering (VE) vs value analysis (VA). The same method applied at different times: VE is applied at the design stage of a new product (prevention of unnecessary cost); VA is applied to an existing product (removal of unnecessary cost). Many organisations use the names interchangeably. The method was developed at General Electric by Lawrence Miles in the 1940s.

Functions. Each function is described by a verb and a measurable noun: "transmit torque", "support load", "conduct current".

  • Basic function: the main purpose; if it is lost the product is worthless.
  • Secondary functions: support the basic function or come from the chosen design (fasten cover, prevent corrosion, improve appearance). Many unnecessary costs hide here.

Worth and value index. The worth of a function is the lowest cost at which it could be reliably performed (for example by a standard part or a simpler design). Value index = worth / cost; values well below 1 point to the best opportunities, and cost − worth is the potential saving.

FAST diagram (function analysis system technique) arranges functions in a how–why logic: reading to the right answers "how is this function achieved?", reading to the left answers "why is it needed?". It exposes functions that exist only because of a particular design choice.

VE job plan.

  1. Orientation / information: select the project, collect drawings, costs, volumes, specifications, customer requirements.
  2. Function analysis: list functions (verb–noun), classify basic and secondary, assign costs and worths, draw the FAST diagram.
  3. Creative (speculation): brainstorm alternative ways to perform the low-value functions — no criticism.
  4. Evaluation (analysis): screen ideas for feasibility, cost and risk; estimate savings.
  5. Development: detailed design, testing and cost estimate of the best ideas.
  6. Presentation and implementation: recommend to management, implement, then follow up and audit actual savings.

Typical VE questions. What is it? What does it do? What does it cost? What else would do the job? What would that cost? Is every feature necessary? Can a standard part be used? Can tolerances or finish be relaxed?

VE is a team activity (design, manufacturing, purchasing, quality, marketing, costing) and connects closely to DFMA and QFD.

Formulas

  • Value: V = F / C
  • Value index of a function: VI = W / C_f
  • Potential saving on a function: S_f = C_f − W
  • Value improvement ratio: V₂ / V₁ = (F₂ / C₂) / (F₁ / C₁)
  • Annual saving: S = (C₁ − C₂) × annual volume; payback of study and change cost: n_p = implementation cost / S

Symbols: F = function, performance or utility measure (points, rating or a physical performance measure); C = cost (₹); W = worth of a function — lowest cost to perform it reliably (₹); C_f = present cost allocated to the function (₹); V has units of F per ₹ and is used to compare alternatives, not as an absolute figure.

Worked examples

Example 1 (standard) — function–cost analysis. The guard assembly of a table fan costs ₹200. The team allocates cost to functions and estimates worth:

  • Protect user (basic): cost ₹120, worth ₹60.
  • Allow airflow (secondary): cost ₹30, worth ₹30.
  • Improve appearance (secondary): cost ₹50, worth ₹20.
  1. Value indices: protect user 60/120 = 0.50; allow airflow 30/30 = 1.00; improve appearance 20/50 = 0.40.
  2. Overall value index = (60 + 30 + 20) / 200 = 110/200 = 0.55.
  3. Potential saving = 200 − 110 = ₹90 per guard, mostly in "protect user" (₹60) and "improve appearance" (₹30).
  4. The creative phase therefore targets the guard's wire count and fastening (protection) and the chrome finish (appearance); airflow needs no work.

Example 2 (GATE level) — value improvement and payback. A redesign raises a pump's performance rating from 80 to 88 points while cutting unit cost from ₹500 to ₹460. Annual volume is 20,000, and the VE study plus tooling changes cost ₹3,00,000. Find the improvement in value and the payback period.

  1. V₂ / V₁ = (88 / 460) / (80 / 500) = 0.19130 / 0.16000 = 1.1957, i.e. value up by 19.6%.
  2. Annual saving = (500 − 460) × 20,000 = ₹8,00,000.
  3. Payback = 3,00,000 / 8,00,000 = 0.375 year (about 4.5 months).

Common mistakes

  • Treating VE as plain cost cutting; cheapening a part that weakens its basic function lowers value.
  • Describing functions vaguely ("is a bracket") instead of verb–noun ("support motor").
  • Confusing worth (lowest cost to perform the function) with present cost.
  • Skipping the information and function phases and jumping straight to brainstorming solutions.
  • Forgetting implementation cost (study, tooling, testing, approval) when quoting savings.
  • Thinking VE and VA are different techniques; they differ only in timing.

For GATE PI

Mostly conceptual MCQs: the definition V = F/C, types of value, basic versus secondary functions, phases of the job plan in order, the purpose of FAST, and the VE/VA distinction. Short numericals ask for a value ratio, a percentage change in value, or a saving and payback. Learn the job-plan phases in sequence.

Quick check

  1. What happens to value if function stays constant and cost falls by 20%?
  2. Which phase of the job plan generates alternatives without criticism?
  3. A function costs ₹180 and its worth is ₹45. What is its value index?
  4. Is "improve appearance" a basic or a secondary function of a machine guard?

Answers: 1. V rises by 25% (1/0.8 = 1.25); 2. the creative (speculation) phase; 3. 0.25; 4. secondary.

Interview questions

All Engineering Economics and Product Design interview questions

Try answering each one aloud before you open it.

  1. 1.What is value engineering?Concept

    Value engineering is a systematic method to improve the value of a product or process by examining its function. It aims to optimize the balance between cost, performance, and quality by identifying and eliminating unnecessary expenses while maintaining or improving functionality.

  2. 2.Explain the concept of value analysis.Concept

    Value analysis is a methodical approach to improving the value of a product by analyzing its functions and identifying ways to achieve those functions at a lower cost. It focuses on understanding the purpose of each component and finding alternatives that provide the same function at a reduced cost without compromising quality.

  3. 3.How does value engineering differ from value analysis?Concept

    Value engineering is typically applied during the design phase of a product or process, focusing on optimizing the design before production. In contrast, value analysis is applied to existing products or processes to improve their value by reducing costs while maintaining functionality. Both aim to enhance value but are applied at different stages of the product lifecycle.

  4. 4.Why is value engineering important in product design?Application

    Value engineering is important in product design because it helps reduce costs, improve product quality, and enhance customer satisfaction. By focusing on essential functions and eliminating unnecessary costs, companies can offer competitive pricing and better products, leading to increased market share and profitability.

  5. 5.What happens if value analysis is not conducted on an existing product?Application

    If value analysis is not conducted on an existing product, the product may continue to incur unnecessary costs, leading to reduced profitability. Additionally, the product may become less competitive in the market as competitors may offer similar products at lower prices or with better features, ultimately affecting the company's market position.

  6. 6.In what scenarios would you prioritize value engineering over value analysis?Application

    Value engineering should be prioritized during the design phase of a new product or process when there is an opportunity to influence the design and cost structure significantly. It is most effective when changes can be made before production begins, allowing for cost savings and design optimization from the outset.

  7. 7.How can value engineering contribute to sustainability in product design?Application

    Value engineering can contribute to sustainability by identifying ways to reduce material usage, energy consumption, and waste in product design. By focusing on essential functions and eliminating unnecessary components, products can be designed to be more environmentally friendly, reducing their ecological footprint and promoting sustainable practices.

  8. 8.Calculate the annual saving if value analysis reduces the cost of a component from ₹500 to ₹350 and 10,000 units are produced per year.Numerical

    Saving per unit = 500 − 350 = ₹150; annual saving = 150 × 10,000 = ₹15,00,000. Before claiming it, subtract the one-time cost of the study, tooling and testing to get the net benefit and payback.

  9. 9.A product's function can be achieved with Material A at ₹200 per unit or Material B at ₹150 per unit. If 5,000 units are needed, what is the cost difference, and what must be checked before switching?Numerical

    Cost with A = 200 × 5,000 = ₹10,00,000; with B = 150 × 5,000 = ₹7,50,000; difference = ₹2,50,000. Before switching, VE requires confirming that B performs the basic function equally well — strength, corrosion, life, processability and any change in machining or scrap cost — otherwise value is not actually improved.

  10. 10.What role does cross-functional teamwork play in value engineering?Application

    Cross-functional teamwork is crucial in value engineering as it brings together diverse expertise and perspectives, enabling a comprehensive analysis of the product or process. Team members from different departments can identify opportunities for cost reduction and performance improvement, ensuring that all aspects of the product are considered and optimized.

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