Here is the short version. Strategic sourcing is deciding. Purchasing is doing.
Strategic sourcing answers questions like: which supplier should we use for this, for how long, on what terms, and should we even buy it at all? Purchasing answers a different question: now that we have decided, how do we get this ordered, delivered and paid for, correctly and fast?
Joseph Richardson, a procurement leader who started his career in defence contracting, described the split well on the Art of Procurement podcast: procurement is "the actual acquisition of the goods and services, and the sourcing would identify the sources from which the goods and services would come from".
Most articles stop there and then tell you strategic sourcing is the important one. That is where they go wrong.
The difference, side by side
| Strategic sourcing | Purchasing | |
|---|---|---|
| The question it answers | What should we buy, from whom, and on what terms? | How do we get this ordered, received and paid for? |
| What starts it | A need, a contract expiry, a market change | A request from someone in the business |
| Time horizon | Months to years | Hours to days |
| What it produces | A supplier choice, a contract, a category plan | A purchase order, a delivery, a paid invoice |
| How often it happens | A few times a year per category | Hundreds or thousands of times a month |
| What good looks like | Better total cost, lower risk, the right supplier | Speed, accuracy, compliance with what was agreed |
| What failure looks like | Locked into the wrong supplier for years | Late orders, wrong prices, maverick buying |
Notice the last two rows. Both jobs can fail, and both failures cost real money. They just fail in different ways.
Where the idea came from, and what it actually said
The modern distinction goes back to a 1983 Harvard Business Review article by Peter Kraljic, then a McKinsey director in Düsseldorf. It was called "Purchasing Must Become Supply Management", and it is still the most cited idea in procurement.
His argument was that the old, quiet world of purchasing was ending. Scarce materials, political turbulence and fast technology change meant companies needed what he called "a total change of perspective: from purchasing (an operating function) to supply management (a strategic one)".
But read the article and you find something most summaries miss. Kraljic did not say every purchase needs strategy. He said you should sort everything you buy by two things — how much it affects profit, and how risky its supply is — and then handle each group differently.
He defined profit impact as the volume purchased, its share of total purchase cost, or its effect on product quality or business growth. Supply risk came from availability, the number of suppliers, competing demand, make-or-buy options, storage risk and whether substitutes exist.
| Kraljic's group | His examples (1983) | How he said to manage it | Time horizon he gave |
|---|---|---|---|
| Noncritical items — low impact, low risk | Steel rods, coal, office supplies | Purchasing management | Normally 12 months or less |
| Leverage items — high impact, low risk | Electric motors, heating oil, computer hardware | Materials management | Typically 12 to 24 months |
| Bottleneck items — low impact, high risk | Electronic parts, catalyst materials, outside services | Sourcing management | Varies with availability |
| Strategic items — high impact, high risk | Scarce metals, high-value components | Supply management | Up to ten years |
Look at the first row. Kraljic explicitly said that for noncritical items, purchasing management is the right approach. Not a lesser one. The right one.
That is the part that matters most for a real company, because most of what a company buys, by number of transactions, is noncritical. Running a full sourcing exercise on office supplies does not make you strategic. It makes you slow.
What strategic sourcing actually involves
Strip out the jargon and strategic sourcing is a handful of steps. Two of the most useful published guides come from government, which is worth knowing because government has to write its reasoning down.
1. Understand what you are really buying
Before looking at suppliers, look at the need. Can the requirement be standardised? Does the business actually need the premium version? The US Government Accountability Office studied leading companies — including Boeing, Dell, Pfizer and Walmart — and found standardising requirements was one of four core tactics they used.
2. Decide whether to buy it at all
The UK Government's Sourcing Playbook requires what it calls a delivery model assessment — previously known as a "make versus buy" assessment — before deciding to outsource, bring in-house or re-procure a service. It is the step most private companies skip entirely.
3. Understand the market
How many suppliers are there? How healthy are they? Is the market competitive, or do two companies control it? The same Playbook requires an early assessment of market health and capability, so that limits in the market are found before the tender, not after.
4. Work out what it should cost
This is the step that most separates sourcing from purchasing. Instead of asking suppliers what they want to charge, you estimate what the thing should cost from its parts: labour, materials, overhead, margin. The UK Playbook calls this a Should Cost Model and says it helps protect buyers from "low cost bid bias" — choosing a price that looks good but cannot actually be delivered.
5. Choose the right tactic for the market
The GAO found leading companies did not treat every category the same. They sorted services by two things — how complex the service was and how many suppliers existed — then used different tactics. Walmart used its scale to compete simple services with many suppliers, such as maintenance. Dell negotiated cost drivers like labour rates for complex services with few suppliers, such as consulting.
That is Kraljic's idea again, thirty years later, found independently by auditors.
6. Evaluate bids properly
One warning from the UK Playbook deserves wider attention. Scoring each bid's price relative to the lowest bid — so the cheapest gets full marks and everyone else is marked down against it — "can have many unintended consequences and should not be used unless there is a specific business reason". It rewards the lowest price even when that price is unrealistic.
7. Contract, then keep managing
Signing the contract is the middle of strategic sourcing, not the end. The price you agreed only turns into savings if people then buy from the supplier you chose, at the price you agreed. That handover — from sourcing to purchasing — is where most value is lost.
Does strategic sourcing actually pay?
The evidence says yes, with sensible caveats.
Be clear about what that figure is. It came from officials at seven large companies, it was self-reported, and GAO itself described the sample as not generalisable. It is also from 2013. It is a useful range, not a promise.
More recent data points the same way. Ardent Partners' 2025 research found each extra dollar brought under procurement's management produced savings of 6% to 12% in the first contract period. The Hackett Group's best procurement teams run sourcing cycles 24% shorter than their peers, and get involved at the start of sourcing processes 15% more often.
Why purchasing deserves more respect than it gets
Here is the uncomfortable truth for anyone who thinks strategy is all that matters. A brilliant sourcing decision produces nothing if purchasing does not follow through.
If people keep buying from the old supplier, the new contract saves nothing. If orders go through at the wrong price, the negotiated rate is theoretical. The Hackett Group's leading procurement teams lose 60% less of their negotiated savings to off-contract buying than everyone else. That is a purchasing achievement, not a sourcing one.
Purchasing is also where the business decides whether procurement is helpful. The Hackett Group's leaders turn a request into a purchase order 58% faster than their peers. Hackett's advisers also noted on their podcast that leading teams put 81% more indirect spend through electronic catalogues, so people can buy approved items themselves without anyone processing each order.
Speed earns trust. Trust earns the early involvement that makes strategic sourcing possible. The two jobs depend on each other.
Common mistakes
Running a full tender on something small
A three-month sourcing process for a £5,000 annual spend costs more in staff time than it could possibly save. Kraljic's noncritical items need a fast, compliant buying route, not a tender.
Treating a strategic item as a transaction
The opposite mistake is worse. A critical component bought by whoever raised the purchase order, from whoever answered the phone, is a supply risk waiting to happen.
Sourcing once and never revisiting
Markets change. A contract that was competitive three years ago may not be now. Put every significant contract's end date in a calendar and review it at least 90 days before it expires.
Choosing on price alone
Price is one input. Delivery reliability, quality, the supplier's financial health and switching costs all matter. The UK Playbook's warning about low cost bid bias exists because government learned this the expensive way.
How a small team should split the work
Most mid-sized companies do not have separate sourcing and purchasing teams. One or two people do both, which usually means purchasing crowds out sourcing because purchasing is urgent and sourcing is merely important.
A simple way to decide where effort goes:
- Sort your spend by supplier and category for the last twelve months.
- Put each category into one of Kraljic's four groups. Be honest — most will be noncritical.
- For noncritical and leverage items, focus on making buying fast and compliant: catalogues, preferred suppliers, clear approval limits.
- For bottleneck and strategic items, do the real sourcing work: market analysis, should-cost thinking, proper evaluation, and a named owner.
- Protect time for the strategic work by moving the routine purchasing load off the people who should be doing it.
The last step is the one that usually decides whether the rest happens.
Common questions
What is the difference between strategic sourcing and purchasing?
Strategic sourcing decides what to buy, from which supplier, on what terms and for how long. Purchasing carries out those decisions: turning a request into a purchase order, receiving the goods and getting the invoice paid. Sourcing happens a few times a year per category over a horizon of months to years. Purchasing happens hundreds or thousands of times a month over hours or days.
Is strategic sourcing better than purchasing?
No. They are different jobs and both are necessary. Peter Kraljic, who drew the distinction in his 1983 Harvard Business Review article, said purchasing management is the right approach for noncritical items such as office supplies. A great sourcing decision also saves nothing if purchasing does not follow through, which is why the best teams lose 60% less of their negotiated savings to off-contract buying.
What is the Kraljic matrix?
A way of sorting everything you buy by two factors: profit impact and supply risk. It produces four groups. Noncritical items (low impact, low risk) suit purchasing management. Leverage items (high impact, low risk) suit using your buying power. Bottleneck items (low impact, high risk) need secure supply. Strategic items (high impact, high risk) need long-term supply management over horizons of up to ten years.
What are the steps in strategic sourcing?
Understand the real requirement and whether it can be standardised; decide whether to buy it at all; assess the supply market; estimate what it should cost from its components; choose a tactic that fits the market; evaluate bids on more than price; then contract and keep managing. The UK Government's Sourcing Playbook and the US GAO's study of leading companies both describe versions of these steps.
How much does strategic sourcing save?
Leading companies interviewed by the US Government Accountability Office reported savings of 4% to 15% over prior-year spending from strategically sourcing services. That comes from seven large companies, self-reported, in 2013, and GAO described the sample as not generalisable. More recently, Ardent Partners found each extra dollar brought under procurement's management produced 6% to 12% savings in the first contract period.
What is a should-cost model?
An estimate of what something ought to cost, built from its components — labour, materials, overhead and a reasonable margin — rather than from what suppliers quote. The UK Government's Sourcing Playbook requires one for complex outsourcing and says it helps protect buyers from low cost bid bias: choosing a price that looks attractive but cannot realistically be delivered.
Should every purchase go through a sourcing process?
No. Running a full tender on a small, low-risk spend costs more in staff time than it can save. Most transactions are noncritical and need a fast, compliant buying route such as a catalogue or preferred supplier. Save proper sourcing effort for high-impact or high-risk categories where the decision genuinely changes the outcome.
What is the difference between sourcing and procurement?
Procurement is the whole function: sourcing, purchasing, contract management, supplier management and paying suppliers. Sourcing is the part that identifies and selects suppliers. Purchasing is the part that places and completes orders. As procurement leader Joseph Richardson put it, procurement is the actual acquisition, while sourcing identifies where the goods and services come from.
How should a small team balance sourcing and purchasing?
Sort twelve months of spend by category, place each category in one of Kraljic's four groups, make buying fast and compliant for the routine groups, and do real sourcing work only on bottleneck and strategic categories. The hardest part is protecting time for sourcing, because purchasing is always urgent. Moving the routine purchasing load off the people who should be sourcing is usually what makes it possible.
Why should you not score bids relative to the lowest price?
Because it rewards the cheapest bid automatically, even when that price is unrealistic. The UK Government's Sourcing Playbook warns that scoring prices against the lowest bid can have many unintended consequences and should not be used without a specific business reason. Evaluate price alongside delivery reliability, quality, supplier financial health and switching costs.
Sources
- Peter Kraljic, Purchasing Must Become Supply Management, Harvard Business Review, September–October 1983, Full article read (HBR reprint 83509). Profit impact and supply risk definitions, and Exhibits III–IV: the four item groups, their management focus and time horizons.
- UK Cabinet Office, The Sourcing Playbook (June 2023), Full 78-page document read. The 11 key policies; delivery model assessments; market health and capability assessments; Should Cost Model and low cost bid bias; the warning on scoring price relative to the lowest bid.
- US Government Accountability Office, GAO-13-417, Strategic Sourcing: Leading Commercial Practices Can Help Federal Agencies Increase Savings When Acquiring Services, 15 April 2013. 4–15% savings; the two variables (complexity and number of suppliers); the four tactics; Walmart and Dell examples; nongeneralisable sample of seven companies.
- Art of Procurement, Episode 171 transcript — with Joseph Richardson, Full transcript read. The definition of procurement versus sourcing at [00:04:01].
- Art of Procurement, The Kraljic Matrix Simply Explained, Limitations of the matrix, including its static, two-dimensional view.
- Ardent Partners, The Metrics that Matter in 2025 (Part One) — CPO Rising, 20 October 2025. 6–12% savings per additional dollar brought under management.
- The Hackett Group, 2025 Digital World Class Procurement research, 14 July 2025. 24% shorter sourcing cycles; 58% shorter requisition-to-PO; 60% less savings lost.
- The Hackett Group, Digital World Class Procurement: Latest Benchmark Metrics and Key Findings (podcast transcript), 22 October 2024. Involvement at the start of sourcing 15% more often; 81% more indirect spend through electronic catalogues.
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