Source-to-contract (S2C)
Source-to-contract (S2C) is the upstream portion of the procurement process, covering spend analysis, sourcing events, supplier evaluation, negotiation, and contract creation. It ends when a signed agreement is in place; the downstream procure-to-pay steps (requisitions, orders, invoices, payment) then execute against that agreement. Source-to-pay (S2P) is the combination of both halves.
Examples
Category event: A drone maker runs S2C on machined parts. Spend analysis shows $4.2M across 14 suppliers, an RFQ on the top 120 part numbers draws 9 bidders, and the award consolidates to 5 suppliers under 2-year agreements at an average 7% price reduction.
Contract-to-execution handoff: The negotiated agreement loads into the ERP with price breaks at 10,000 and 50,000 units. Six months later, buyers release POs at the 50,000-unit tier automatically; no renegotiation needed, because S2C anticipated the volume.
Where it stalls: A team clocks its S2C cycle at 6 weeks from RFQ to award, of which 2 weeks is waiting on engineering to answer supplier questions. The fix is a pre-RFQ spec review, not a faster negotiation.
Definition
S2C is where procurement's decisions get made. Spend analysis establishes what the company buys and from whom, sourcing events test the market, negotiation sets price and terms, and contract management turns the result into an agreement the business can buy against. Everything downstream is execution of what S2C decided.
The boundary with source-to-pay matters because the two halves fail differently. S2C failures are decision failures: weak competition, vague specs, contracts missing volume tiers. Procure-to-pay failures are execution failures: orders placed off contract, invoices that will not match. A company can run flawless transactions against badly sourced contracts and lose money on every clean PO.
In direct materials, the S2C cycle is dominated by the RFQ: packaging drawings and volumes, collecting structured quotes, normalizing them for comparison, and negotiating before award. Teams move these events into e-sourcing tools rather than inboxes once line counts get large. LightSource covers the S2C side for direct-materials teams, managing RFQs, quote comparison, and awards in one workspace.
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