Most of users are operating the interface just based on their instinct. In short when they encounter a button they will think this button will be triggered to meet their needs. But if this button get triggered in some other operation ratner then users expectation it must be a bad design. Interaction design also known as interactive design in this field to design the behavior of human computer system. As an interaction designer we have to create the content and function of products that are useful easy to use user friendly technically feasible and of commercial interest.