The first step when using object-oriented design is to identify all of the categories of inputs that are part of the problem.
Object-oriented design or OOD is a approached method for software design to solving a software problem by process of planning system from interacted objects.
Since, it is a software design to solve software problem based on interacted object, so we must know all object in order to solve a problem especially the object that are part of the problem.
Without identify the input, we don't know the root of problem so we can't solve it. Thus, the first step is to identify all of categories input.
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