If you find that you need to add a feature to your program, the program code structure makes you can't make it easy, then you will refer to that program, making the addition of characteristics easier, then add features. Before reconstructed, check if you have a reliable test mechanism. These testing mechanisms must have self-testing capabilities. Reconstruction techniques must be modified in tiny pace. If you make mistakes, it is easy to find it. Only a program code that humans can easily understand is an excellent programmer.
