Requisition and budget
Someone inside the organisation formally requests the purchase and it is checked against an approved budget line. This is where many deals actually die, invisibly, because the budget was allocated elsewhere and nobody wanted to say so. A champion who cannot name the budget line is not yet a champion.
Sourcing
The buyer identifies candidate suppliers and gathers information, proposals or quotes. Formality scales with value. A small purchase may need one quote; a large one may require a documented competitive process with a written rationale for the selection. The important thing for a seller is when this stage begins, because the evaluation criteria are usually written during it.
Evaluation and negotiation
Proposals are scored against criteria, a preferred supplier is identified, and commercial terms are negotiated. In software purchases, security review, data protection review and legal review commonly run in parallel with this stage rather than after it, which is worth confirming, since a sequential assumption can add a month to your forecast for no reason.
Approval
The purchase is routed through the organisation's delegation of authority. The number of approvals rises with contract value, and duration is often set by meeting schedules rather than by effort. A deal requiring the approval of a committee that sits on the first Tuesday of each month will take as long as that implies, however urgent everyone claims it is.
Purchase order and onboarding
Once approved, a purchase order is issued, and separately the supplier is onboarded into the payment system with bank details, tax registration and any compliance documentation. These are different processes with different owners, and a supplier can hold a valid purchase order and still be unable to be paid because onboarding has not completed.
Delivery, matching and payment
The supplier delivers, someone in the buying organisation confirms receipt, and the invoice is matched against the purchase order and that confirmation before payment is released. Mismatches stop the clock, and the supplier is usually the last to hear about it.