I'm not sure what type of sales job you have, IE what it is exactly you're selling (products, services, is this inside sales vs. outside sales, etc.) but I've always found that ORDER works for me.
Opportunity - is the prospect genuinely interested in what you have, do they have a problem that can be solved with what you can sell them? This is the step where you "peel for pain" - keep asking questions about what they CAN'T do because they don't have what you can sell them. If you're 100% commissioned, this is where you can figure out pretty quickly if you have a whale or you're pitching the bitch
Resources - do they actually have the money to pay for what you have? Does their budget fit into what you can offer?
Decision process - let them ask questions at this point, make them feel like what you offer is EXACTLY what they need, and they're screwed without it. If they need someone else to make final approval, talk to them directly and make sure their questions are answered as well. If you've been talking to someone who doesn't have the final say in the purchase, make sure you get someone else involved ASAP who IS able to give a yes or no to the purchase.
Exact solution - Confirm that you can deliver on everything you've promised, make sure the customer knows exactly everything they're getting. Make sure there is nothing that might block the sale at this point.
Relationship - even if things go south, stay positive and upbeat. I've gotten clients after deals were lost due to this. And if you do get the deal, be sure to ask if they know anyone else who can use something you're offering. A lot of salespeople just assume that a customer will recommend them to someone else; be proactive and flat out ask if they know anyone they can introduce you to, whom they think might benefit from your products/services.
Good luck!