There are many closing techniques and there are some common tips that are offered to make closing even more successful.
ABC is good advice when it is used to keep in mind that you are always aiming towards a close. It is bad when you just use it to mean battering the customer to death with a barrage of unsubtle closing techniques.
Selling can be a lot like fly fishing. If tug hard on the line, it will snap and the fish will get away. The best method is a gentle coaxing that gradually brings the fish in to shore - although sometimes when they are spooked that I have to let them out again and calm them down further away.
Silence also builds tension and will encourage them to respond - and a response to a well-put closing question will hopefully be positive.
Never try closing when they are in a negative emotional state - it will only cause further objection and possibly anger that means they will never buy again.
It is often the fear of the other person saying 'no' that often causes a sales person to keep on talking. I must have faith and also accept that when they say 'no' it is no real comment about you. If I take rejection personally then I am probably in the wrong job.
The consequence of this is that when customers say they will be back,cannot count on it and should treat this as if they will not and decide either to move to the next customer or redouble my sales efforts.
When did I can meet the customer again, then you can have intermediate goals and closure may just be and agreement to meet again. It can also ask for commitment to certain acts such as getting you information or looking at a website. Generally, if getting the other person to commit to some action, I am moving the sale forward.
It also depends on the sophistication of the customer. A professional buyer in a big company has been on all the sales courses themselves and can see a closing technique coming from several miles away.