System development methods
System development methods（１）Waterfall modelThis model is to developing the system from requirement definition to testingin order. This model name comes from the flow of the waterfall.Please image building your own house. The order is as follows.①Requirement DefinitionThe housebuilder asks what kind of house the customer wants to build.How many floors？ How about color？ Just like this.②External DesignTo design the new house like drawing a rough sketch.③Internal DesignTo choose the materials of all parts.④Program DesignTo draw up a blueprint including the size of all parts.⑤CodingTo build a new house with the saws or the hammers.⑥Testing（Unit testing, integration testing and system testing, et
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