Managing Complexity

Software is complex. It is normal for you not to be able to know all the ins and outs of your program. Yet, you have to if you plan to be a successful programmer. The primary imperative in any kind of design is Managing Complexity. So, whenever the program it's close to get out of control, you probably need more design. You do not need design when you can understand it. In any moment of your development process, remember that your main goal is to Manage the complexity. Everything is secondary to this.