List the buyer, user, budget owner, implementation owner, risk owner, vendor, channel partner, and critical suppliers. For each actor, record what it contributes, receives, approves, and can refuse. A user may value speed while procurement values predictable cost and security values bounded access. Demand exists only when enough of these interests can be reconciled into an authorized purchase and a workflow the organization can actually adopt.
Then map the exchanges. The buyer supplies money, data access, process knowledge, review, and change effort. The vendor supplies software, capacity, integration, support, and evidence. Suppliers provide models, data, infrastructure, or tools. These exchanges reveal hidden costs that a revenue-only market model misses. They also expose dependencies, such as a buyer benefit that requires operational change outside the vendor's direct control.