The Screen IS the Application

The Screen IS the Application and How to Design Your Rail Application. These articles have a very practical approach to building user-oriented-applications , especially web-applications

sketch the most important pieces-> db -> model, testcases -> html
sketch the second most important -> db -> model, testcases -> html
etc.

Currently I am skipping the "TestCases" part, but sooner or later I will have to start. TestCases becomes more and more crucial for scripting languages because they don't have the advantage of compiler . And without TestCases, refactoring even a medium sized project(scripting language) is a potential suicide.