The sales funnel process outlines 6 key stages to progressing a sales opportunity from initial contact to closing a deal. Each stage has criteria that must be met to yield the associated percentage chance of winning the opportunity. The stages are: 1) Discovery, 2) Needs Analysis, 3) Qualifying, 4) Proposal, 5) Negotiations, 6) Closed Won. Advancing through each stage increases the potential for winning the deal from an initial 10% to a final 100% chance of winning.