The surgeon. Mills calls him a chief programmer. He personally defines the functional and performance specifications, designs the program, codes it, tests it, and writes its documentation. He writes in a structured programming language such as PL/I, and has effective access to a computing system which not only runs his tests but also stores the various versions of his programs, allows easy file updating, and provides text editing for his documentation. He needs great talent, ten years experience, and considerable systems and application knowledge, whether in applied mathematics, business data
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