Strategic Management and Corporate Finance · Analyzing the External and Internal Environment

Value Chain Analysis: Porter's Primary and Support Activities

Updated 11 October 2026 · Fact-checked

Value chain analysis, developed by Michael Porter, breaks a firm into the activities it performs to create a product or service. You separate primary and support activities, study the cost and value of each, and find where the firm gets cost advantage or differentiation. Then you decide what to improve, outsource or keep.

Understand Value Chain Analysis

Every firm takes inputs, does work on them and sells an output. Porter's idea is that competitive advantage does not come from the firm as a whole. It comes from the discrete activities the firm performs, such as buying raw material, running machines, selling and servicing.

The value chain is the full set of these activities, arranged in the order they add value. The value the customer pays for, minus the total cost of performing the activities, is the margin. A firm earns a profit when customers pay more than the activities cost.

Porter splits activities into two groups. Primary activities are directly involved in creating the product and delivering it to the buyer: inbound logistics, operations, outbound logistics, marketing and sales, and service. Support activities help the primary ones and the firm as a whole: procurement, technology development, human resource management and firm infrastructure (general management, planning, finance, legal, quality). Support activities cut across all primary activities.

To analyse the chain, you list each activity, assign costs and assets to it, and compare it with competitors or best practice. If an activity is done at lower cost, you have a cost advantage. If an activity makes the product better in a way the buyer values, you have a source of differentiation. Linkages matter too. A cost spent in one activity, such as better design, can reduce cost in another, such as service or production.

Value chain analysis looks inside the firm, so it is a tool of internal analysis. It also shows which activities are core strengths and which could be outsourced. It extends beyond the firm into the supplier and buyer chains, which together make up the value system.

Key rules to remember

Primary activities: Inbound logistics + Operations + Outbound logistics + Marketing and sales + Service; Directly involved in creating and delivering the product. Remember the order, which follows the flow of the product.
Support activities: Procurement + Technology development + Human resource management + Firm infrastructure; They support all primary activities. Firm infrastructure covers general management, finance, planning, legal and quality.
Margin: Margin = Total value (what buyers pay) − Total cost of all value activities; Advantage comes from widening this gap, either by lowering cost or by raising the price buyers accept.
Sources of advantage: Cost advantage = performing activities at lower cost; Differentiation = performing activities in a unique way valued by buyers; These link to Porter's generic strategies of cost leadership and differentiation.

How to solve Value Chain Analysis questions

Use this method for any question that asks you to analyse a firm's value chain or to explain it with a case.

1State the concept in one or two lines: value chain is the set of activities a firm performs to create value, split into primary and support activities.
2List the primary activities that apply to the firm in the case, and tie each to a fact given in the question.
3List the support activities in the same way, and note which primary activities they serve.
4Judge each activity: is it a cost driver, a source of differentiation, or a weakness compared with competitors?
5Look for linkages between activities, where spending in one lowers cost or improves value in another.
6Identify the sources of cost advantage and differentiation, and say which activities to improve, outsource or retain.
7Conclude with a recommendation or the strategic implication, such as supporting cost leadership or differentiation.

Quickest way: Five plus four scan

When to use it: Use it when a short case is given and you have limited time to write a structured answer.

Write the five primary activities as a quick row on your rough sheet.
Write the four support activities under them.
Mark each with a tick (strength), a cross (weakness) or a dash (no data) using the case facts.
Pick the two or three strongest points and label each as cost or differentiation.
Write the answer in that order: definition, activity-wise findings, advantage, recommendation.

Common mistakes in Value Chain Analysis

Placing procurement among the primary activities.
Buying inputs feels like the first step of the product flow, so students confuse it with inbound logistics.
Fix: Inbound logistics is receiving, storing and handling inputs. Procurement is the function of purchasing them and is a support activity.
Listing activities without linking them to the case facts.
Students memorise the framework and write it generically.
Fix: Attach each activity to a specific fact from the question and state whether it gives cost advantage or differentiation.
Treating value chain analysis as the same as SWOT analysis.
Both deal with strengths and weaknesses of the firm.
Fix: Value chain analysis is an activity-by-activity study of internal operations. SWOT is a summary that also covers external opportunities and threats. The value chain feeds the strengths and weaknesses part of SWOT.
Ignoring linkages between activities.
Students treat each activity as an isolated box.
Fix: Show at least one linkage, for example higher quality in operations reducing service costs.
Forgetting that firm infrastructure is a support activity.
It sounds like buildings and plant rather than management systems.
Fix: Remember it as general management, planning, finance, legal and quality systems that support the whole chain.
Ending without a strategic conclusion.
Students think describing the chain is enough.
Fix: Close with what the firm should do: strengthen, outsource or redesign activities to support its chosen strategy.

Worked examples

Example 1

Explain the primary and support activities in Porter's value chain and state how the analysis helps a firm.

Show the solution

Define: the value chain is the set of activities a firm performs to design, produce, market, deliver and support its product.
Primary activities: inbound logistics (receiving and storing inputs), operations (converting inputs into the product), outbound logistics (distribution), marketing and sales, and service (after-sales support).
Support activities: procurement, technology development, human resource management and firm infrastructure.
Explain that support activities serve all primary activities and not just one.
Benefits: the firm finds where cost can be cut, where it can differ from rivals, which activities to outsource, and how linkages can add value.

Answer: The value chain has five primary activities (inbound logistics, operations, outbound logistics, marketing and sales, service) and four support activities (procurement, technology development, human resource management, firm infrastructure). Analysing it helps the firm find sources of cost advantage and differentiation and decide which activities to improve or outsource.

Example 2

Suresh Textiles of Surat makes cotton fabric. It buys yarn in bulk from a nearby supplier, runs automated looms that cut wastage, and sells through a network of dealers. Its after-sales complaint handling is slow. Analyse using value chain analysis and suggest a strategy.

Show the solution

Inbound logistics and procurement: bulk purchase from a nearby supplier lowers input and transport cost. This supports cost advantage.
Operations and technology: automated looms cut wastage and unit cost. Another source of cost advantage.
Outbound logistics and marketing: the dealer network gives wide reach, which is a strength.
Service: slow complaint handling is a weakness. It may hurt buyer loyalty and reduce the value buyers perceive.
Linkage: lower production cost is not helping if poor service lets customers leave. Improving service, supported by human resource training, would protect margin.
Implication: the firm's strengths suit a cost leadership strategy. It should fix the service activity, so that the value buyers pay for is not eroded.

Answer: Suresh Textiles has cost advantages in procurement and operations and reach through dealers, but a weakness in service. It should keep cost leadership, and improve service through training and a faster complaint process.

Exam tips

Write the five primary and four support activities from memory in the correct order. Examiners check the list first.
Always tie each activity to a fact in the case. Generic listing scores less than applied analysis.
Name the outcome clearly for each point: cost advantage or differentiation.
If asked to compare with SWOT, say value chain is internal and activity-based, while SWOT also covers external factors.
Finish with a recommendation. Case-based answers reward a conclusion.

Practice questions from Analyzing the External and Internal Environment

Value Chain Analysis in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Value Chain Analysis: frequently asked questions

What are the primary and support activities in the value chain?

Primary activities are inbound logistics, operations, outbound logistics, marketing and sales, and service. Support activities are procurement, technology development, human resource management and firm infrastructure. Support activities serve every primary activity.

How is value chain analysis different from SWOT analysis?

Value chain analysis studies the firm's own activities one by one to find where cost or differentiation arises. SWOT is a summary framework covering internal strengths and weaknesses and external opportunities and threats. The value chain can supply the internal part of a SWOT.

How do you do value chain analysis?

Identify the firm's activities, group them into primary and support, assign costs and value to each, and compare them with competitors. Then find the sources of cost advantage and differentiation and decide what to improve or outsource.

Is value chain analysis part of internal or external analysis?

It is internal analysis, since it examines activities within the firm. It can still extend to suppliers and buyers when you study the wider value system.