One topic we regularly teach in workshops for our customers is object
oriented design (ODD), i.e. the art of crafting classes/interfaces in a way that the result is an easy-to-understand, maintainable and flexible code base. With the agile focus on shipping working software, some might consider the skill of OOD less important. One popular argument is that quick reaction to change is more important than designing objects and their interaction carefully. I personally look at it the exact other way around. This blog post summarizes why you need to learn OOD first, in order to avoid it to some degree again.
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