Make-Versus-Buy Decisions: A Practical How-To Guide
The make-versus-buy decision, also called the insource-versus-outsource decision, is the question of whether an organisation should produce a product, provide a service, or perform an activity internally using its own people, processes, and capital, or procure it from an external supplier. It is one of the most consequential strategic decisions in supply chain management because it determines which capabilities the organisation builds and retains versus which it depends on others for.
Here is a practical how-to guide for approaching make-versus-buy decisions rigorously.
Step 1: Define the Decision Correctly
The make-versus-buy decision is not primarily a cost comparison -- it is a strategic capability question. The relevant question is not 'is it cheaper to make or buy this?' but 'does performing this activity internally build and retain capability that is strategically important to us, and can we perform it at a level of quality and efficiency that is competitive with what the market can provide?' Cost is a major factor, but it is not the only factor.
Step 2: Identify All Relevant Costs
Make costs include: direct labour and overhead, raw materials and components, capital investment in equipment and facilities, quality control and inspection, management attention and overhead allocation, and the opportunity cost of capital and management time deployed in the activity.
Buy costs include: the purchase price, transaction costs (sourcing, negotiating, contract management), supply chain risk (dependency on a single supplier, supply disruption risk), transition costs if the decision is later reversed, and the loss of internal capability and knowledge that may be difficult or costly to rebuild.
The make-versus-buy analysis should explicitly include switching costs -- the cost of reversing the decision in the future. An activity that appears cheaper to outsource on a five-year cost model may be strategically expensive if it will cost significantly more to bring back in-house if the outsourcing relationship fails.
Step 3: Assess Strategic Fit
Core versus non-core: Activities that are core to the organisation's competitive differentiation -- where internal capability is a source of competitive advantage -- should have a high threshold for outsourcing. Activities that are non-core commodity services should have a high threshold for insourcing.
Proprietary knowledge risk: Outsourcing an activity that involves proprietary processes, designs, or data creates intellectual property risk. If the activity involves knowledge the organisation does not want external parties to have, this is a strong make argument.
Supply market assessment: Is the supply market for this activity competitive, capable, and stable? An activity that can only be performed by one or two suppliers globally has a very different risk profile from one that can be sourced from multiple competitive providers.
Step 4: Document the Decision and Its Rationale
Make-versus-buy decisions made informally are often revisited informally -- without reference to the original analysis or the conditions that made the original decision correct. Document the decision, the key assumptions (volume, cost, market conditions, strategic priorities), and the conditions under which the decision should be revisited. Review make-versus-buy decisions every three to five years, or when material changes occur in cost structure, supply market dynamics, or strategic priorities.
XNM supports public-sector and capital-project organisations in sourcing strategy, make-versus-buy analysis, and procurement advisory. Reach out to XNM's procurement, sourcing & contract management team to discuss sourcing strategy and make-versus-buy analysis for your organisation.