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Interaction designers would begin by doing the latter. It is important to realize that having a clear understanding of why and how you are going to design something, before writing any code, can save enormous amounts of time, effort, and money later on in the design process. Ill thought-out ideas, incompatible and unusable designs can be refined while it is relatively easy and painless to do so. Once ideas are committed to code they become much harder to throw away. Such preliminary thinking through of ideas about the user experience and what kinds of designs might be appropriate is, however, a skill that needs to be learned. It is not something that can be done overnight by following a checklis...