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A small to medium sized software project isn't a whole lot different in the approach required There will be a period of planning between the customer and the software designer The customer will be the one who specifies what is most important to include in the software system The designer will analyze the requirements, and produce a high level design for the system - what it needs to do, how it will be organized, what its parts are After the customer and designer agree, then a more detailed design is produced to determine such details as what programming language will be used, what the objects in the system are, and what the basic structures of those objects are Finally, programmers will turn the design into a running program The time frames for this size of project typically run about a year or so The number of programmers varies - usually at least 2 or 3, but less than 10 And depending on the specific application, there usually isn't a need for developers with specialized knowledge For projects of this size, often basic software tools will be enough, with perhaps a few specialized tools being used Finally, consider building a huge office building Now the situation is much different The customer will likely have put a considerable effort into deciding that they need to build a big building, and just what that building will do for their business They need to then work with a large architectural firm with considerable experience in building large office buildings They would use different firms if the project were for a highway, airport, or power plant The analysis and design phase of the project can take many months, even years, before the actual construction begins The construction company is likely to be completely independent of the design company, and will use tens or hundreds of workers skilled in building office buildings They will work with a detailed set of plans and specifications produced by the designers The project will likely need large, expensive equipment that requires specialists to operate The whole project may require layers of management to keep everyone involved on track
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A large software project is in many ways similar The up front analysis and design phase can take years The design process will likely require the input from experts in various fields of the application area, and experts in designing large software systems of a specific nature The result of the analysis and design will be a detailed specification that can be passed on to software companies that specialize in building large systems The whole process may take years and involve tens or hundreds of software designers and programmers Expensive software tools that require extensive training to use may be needed to make the project work, and outside consultants may be required There are some other traits buildings and software have in common First, the result of the effort will be around for a long time You may think you are writing a quick and dirty software application, but inevitably, it will continue to exist for years and years Second, after you are finished, there will be bugs You will have missed getting a nail in the right spot, and your shed roof leaks Your software will have bugs And finally, you will end up wanting to add on - either to your building, or to your software And you will occasionally need to refurbish to keep up with the latest trends in house interiors, or user interface design Of course, this analogy isn't perfect People have been building structures for a long time There are standard construction materials and techniques There are official building codes, and inspectors to be sure the codes are followed Software isn't quite that mature, yet, and in many ways, software can be much more complex The number of lines of code in a software project can easily exceed the number of parts used in a building And software doesn't have the equivalent of building codes and building inspectors (and is isn't clear that it ever can, although people are trying) There is another difference For many software projects, good programmers are likely to participate in all phases of building the system, from start to finish
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