Whenever you are beginning to launch or develop something, you should have a roadmap. It will guide you to take the straight positive path for the creation of the app or website. For example, if you are planning to develop an app like Amazon, you must use the roadmap to ease the way of online shopping, delivering the items to the customer, and more importantly payment transactions. Once you have complete guidelines and a detailed plan for the designing of all these features, you can easily create an app. What do you think about it?