Arguably one of the best ways to develop a web application is to follow the agile approach. Application development is one of the most complex activities in modern IT world. Agile approach helps to create an application with excellent user experience and have people rave about it as it is bug-free and easy to use. First what you need to do is sketch out as many ideas as possible for the solution you need to develop, for example, that will include flex or flash programming. This is like brainstorming and most of the sketches will not be used but they will be an enormous help because at the end of the process you will arrive at the single right application idea that is perfect for the goals set. Once you have the right idea, you can create an interactive prototype and see how it will go down. In a simulacrum of the end product you can test the viability of the basic concept behind the product. You can see if it will work in realistic environments and what users will have to say about using the prototype. Then the professional web and software developers have to test the prototype for bugs and errors. It is important to test often and test at different stages of development, as early on as the initial ones. If you follow these simple tips you will have a product that users will simply love.