3.2 Sourcing Strategy & Make-vs-Buy
Key Takeaways
- Strategic sourcing aligns category-level spend with business objectives rather than treating purchasing as transactional cost-cutting.
- Make-versus-buy decisions are driven by total cost of ownership, core-competency strategy, capacity, and risk, not by purchase price alone.
- Total cost of ownership (TCO) sums acquisition, ownership, and post-ownership costs across the full life of the sourced item or relationship.
- The Kraljic portfolio matrix classifies spend by profit impact and supply risk into leverage, strategic, non-critical, and bottleneck quadrants, each with a distinct strategy.
- Outsourcing should retain core, differentiating activities in-house and transfer non-core activities where a supplier holds a sustainable advantage.
Why Sourcing Strategy Is Heavily Weighted
Sourcing Products and Services is about 17% of the CSCP exam — one of the largest modules. The exam treats sourcing as a strategic discipline. Strategic sourcing is the continuous process of analyzing spend, segmenting categories, selecting and developing suppliers, and aligning supply with enterprise objectives such as cost, quality, innovation, and resilience. Procurement is the broader function that includes strategic sourcing plus the operational purchase-to-pay activity covered in 3.3.
Category Strategy
A category is a logical grouping of similar goods or services (for example, packaging, freight, IT services). Category management builds a tailored strategy per category instead of one purchasing policy for everything. The process is roughly:
- Profile the category: spend, suppliers, demand, specifications.
- Analyze the supply market and total cost drivers.
- Position the category (often using the Kraljic matrix below).
- Select a sourcing approach (competitive bid, partnership, consolidation).
- Execute, then measure and continuously improve.
Make-versus-Buy and Total Cost of Ownership
The make-versus-buy decision asks whether to produce internally or purchase from a supplier. It is a strategic choice driven by:
- Core competency — keep activities that differentiate the firm; buy the rest.
- Total cost of ownership, not unit price.
- Capacity and capability — internal slack, technology, scale.
- Risk — supply continuity, IP exposure, quality control, demand volatility.
Total cost of ownership (TCO) is the sum of all costs across an item's life:
| TCO stage | Example costs |
|---|---|
| Acquisition | Unit price, sourcing effort, freight, duties, tooling |
| Ownership | Inventory carrying, quality/inspection, downtime, energy, maintenance |
| Post-ownership | Warranty, disposal, returns, end-of-life, switching cost |
A supplier with a higher unit price but lower defect rate and faster lead time can win on TCO. The exam consistently rewards the TCO-based answer over the lowest-price answer.
The Kraljic Portfolio Matrix
The Kraljic portfolio matrix segments purchased items on two axes: profit impact (spend, value contribution) and supply risk (scarcity, number of suppliers, substitutability). Each quadrant gets a different strategy.
| Quadrant | Profit impact | Supply risk | Strategy |
|---|---|---|---|
| Non-critical (routine) | Low | Low | Simplify, automate, catalog/P-card buying |
| Leverage | High | Low | Use buying power, competitive bidding, consolidate volume |
| Bottleneck | Low | High | Secure supply, safety stock, alternative sources, contracts |
| Strategic | High | High | Partner, collaborate, joint development, long-term contracts |
The matrix is a positioning tool: it tells you how to engage a category, not which single supplier to pick. Misreading a bottleneck item as routine (and chasing price) is a common exam distractor.
Supplier Selection
Supplier selection moves from many candidates to a chosen source through a structured funnel: define requirements, identify the market, issue solicitations, evaluate against weighted criteria, and award.
- Request for Information (RFI) — qualify and learn the market.
- Request for Proposal (RFP) — solution-oriented; used when requirements are complex or value beyond price matters.
- Request for Quotation (RFQ) — price-oriented; used when specifications are clear and comparable.
A weighted-point (scoring) model rates each supplier on criteria (quality, delivery, cost, capacity, financial stability, sustainability) by importance weight, producing a comparable composite score. Selecting only on lowest quoted price ignores TCO and risk and is usually the wrong exam answer.
E-Sourcing and Outsourcing
E-sourcing uses digital tools to run the sourcing process: e-RFx platforms, supplier portals, spend-analytics dashboards, and reverse auctions (suppliers bid the price down in real time). Reverse auctions suit leverage-quadrant, well-specified commodities with multiple capable suppliers; they are inappropriate for strategic or single-source relationships.
Outsourcing transfers an activity to an external provider. The guiding rule: retain core, differentiating activities; outsource non-core activities where a supplier has a durable cost, scale, or capability advantage and the relationship can be governed and measured. Outsourcing transfers execution, not accountability — risk, IP, and service-level governance remain with the buying firm.
A purchased component has high annual spend but many qualified, interchangeable suppliers and stable availability. Where does it sit on the Kraljic matrix, and what is the recommended strategy?
Which factor should most strongly drive a make-versus-buy decision according to CSCP sourcing principles?
For which category is an online reverse auction most appropriate?