Procurement Analysis Methodology
This section documents the analytical methods EXOS runs, written as methods rather than as product pages. Each entry states the question the method answers, the evidence it requires, the arithmetic it performs, the accuracy that can be expected of it and the cases where it does not apply. Where a method is executed in the platform, the scenario chain that performs it is named at the end of the page — the method itself is independent of the software and can be run on paper.
Methods are organised by the unit they operate on. A method that tests one supplier quotation is a different instrument from one that ranks a category portfolio, and applying either in place of the other produces a confident answer to a question nobody asked. Where a method has a lighter and a heavier form — cost decomposition and should-cost analysis, for example — the distinction and the order in which to run them is stated in the page itself.
Each page carries its evidence section, including what could not be sourced. Figures that circulate without a traceable origin are named as such rather than repeated.
A supplier citing inflation is making a claim about their own cost structure. The method that decomposes that claim into the share the indices justify.
Concentration risk is measured before signature, not after failure. How to test whether an alternative is real, and meet the DORA pre-contractual duty.
A specification is a commercial decision. Its largest cost is usually the suppliers eliminated before the tender exists, not the premium on the part.