The four situations that justify it
A category is material and untested
If a single area of spend is large enough to matter and has not been competitively tested for several years, there is usually value in it. This is the most common reason and the easiest to justify, because the analysis that proves it is cheap.
A process needs running properly
Tenders take real time. Specification, market engagement, evaluation design, moderation, award and mobilisation are all work, and doing them badly is worse than not doing them at all. Bringing in someone who runs these regularly is usually about capacity rather than knowledge.
One negotiation matters more than the rest
A renewal that carries a significant part of your cost base is worth preparing for properly. Preparation is where negotiations are won: knowing the supplier's position, knowing your alternatives, and knowing what you will actually do if they say no.
You need the capability, not just the outcome
Sometimes the point is to leave the business able to do it again next year. That is a different engagement, with handover and training built into it, and it should be scoped and priced as such.
When it is not worth it
- The spend is small and fragmented. The cost of the process exceeds the prize.
- You are not prepared to change supplier. Without a credible alternative you have no leverage, and everyone in the room knows it.
- You already know the answer and want external validation. That is an expensive way to buy confidence.
- The real problem is not procurement. If the specification is wrong, or demand is not controlled, buying it better will not help.
How to start small
Buy analysis first. A short, fixed-fee piece of work that puts twelve months of spend on one page tells you where the value is, whether it is worth pursuing, and whether you want to work with the people involved. Decisions about anything larger are much easier after that.