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But now you want to turn your program into a product. That s a whole different game. So in the rest of this chapter, I d like to show you how to create a product specification which contains just the level of detail you need to write a program that can be turned into a successful product. Therefore, the next step after writing that brief but elegant definition of your product is to create the software equivalent of an architect s plan a more detailed specification of exactly what your program does. I know that this might seem a bit boring or tedious, but trust me, it will pay off big down the road. So push through this task. You ll end up with a plan for success.
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Systems Analysis in Sixty Seconds: Input, Process, Output, Storage
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In a large organization, defining a program is the job of a systems analyst. The systems analyst stands between the programmer and the end user, and translates the needs of the end user into a specification that the programmer can understand. Again, if you have already created some customized program that you re thinking of turning into a saleable product, you may believe that this step is unnecessary. After all, the program is done. But just like the previous exercise of defining your product, this process never fails to bring to light or clarify fundamental features and processes that you may have overlooked, poorly designed, or awkwardly implemented in your current program. The level of detail you want to put into this specification is entirely up to you. It s for your own use, and so you don t have to make it more detailed than you need for your own purposes. I have done this for myself and my clients on many occasions, and it always pays off in the end. It s not nearly as much fun as programming, but it may be the best spent time on your whole project. So how do you approach this job of creating a product specification Well, all systems, manual or automated, have common functions and can be modeled as in Figure 2-1.
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Figure 2-1. The Archetypal System
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All systems, computer programs or not, can be broken out into these four functions:
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2 So What Do I Do First 1. What goes into the program (INPUT) 2. How the input information is manipulated (PROCESS) 3. What information is delivered to the user (OUTPUT) 4. What data will be stored (STORAGE)
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Even the simplest utility program can be described by these four functions. Note that this approach is very user oriented, not programmer oriented. After all, the program should be defined by what the user needs, not what the programmer thinks is cool. So all of the results of your analysis must be governed by what the users must have to solve the problems they re facing. As a systems analyst, the view that I always take is this: my loyalty is to the user, not the programmer. When I come to a design feature that would be nice for the user, but difficult for the programmer, the user always wins.
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You start this process of defining your product in the OUTPUT box. This starting point may look counterintuitive the output looks like the last thing on the Archetypal System diagram. However, all software is designed to solve a problem to provide information so the user can make a decision or take some action. So ask yourself two questions:
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1. What problem is my user trying to solve 2. What information does the user need out of my program to solve that
problem
How Detailed Do I Have to Make This Output Specification
How detailed should your output specification be It should be just detailed enough to allow you to create these outputs when the time comes. No more. Being a congenitally lazy person, I don t believe in doing any more work than I have to. So I give you the same advice. In the case of The Sleep Advisor, the answer was fairly simple. Stated in terms the user might use, I m not sleeping well. Tell me what my sleep problems are, what s causing them, and how to fix them. That specification is at the simplest, most basic level. If you re ambitious or see value in being more detailed, you can specify how the reports identifying sleep problems and remedies will be structured kind of an outline. More rigorous would be to create a sample report showing the format what font, point size, color, dividing lines, margins, etc. If you re really anal, you can go all the way down to the actual text that will be generated by the program.
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