In the business world, negotiating is as much a part of your life as brushing your teeth is and can make or break the your business, it is therefore important for the deal at hand to benefit both parties involved. The approach that many people take when negotiating is trying to win at the expense of the person they plan on working with, which is quite strange. This way of negotiating is a risk of losing potential clients, customers, deals or even investors because you come with the mentality of making all the money. When approaching someone with an idea, design it so it could be appealing to THEM, know what they want and what they expect to take away from the deal. In other words, do research, this will help you control the meeting.
*THIS IS JUST SHORT, SIMPLE ADVICE. USE IT!!!*