One method of determining user expectations is to look at commonly used products or services to see how they handle a similar situation. Your users will expect your product or service to behave the same way in similar circumstances. To decide which is the best option, you need to determine who will be using it, how they will use it, and what special rules may apply. If you’re in truly unexplored territory, another way of determining your users’ expectations is to ask several potential users of your products or services their opinions and expectations. If you get a unanimous answer, seriously consider designing your product to fulfill those needs.