Basic Advantage of CF over other web technologies

Application Program Maintenance
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The Web changes rapidly, and the sites that don't keep up with the changes will likely languish. An often-ignored part of Web development is the cost of maintaining a Web application over time -- usually by several different people.
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ColdFusion programming uses English-language tags such as cfquery, cffile, cfmail, and so on. These are easy to read and understand. Coldfusion Programs also tend to be self-documenting. This means that anyone who knows ColdFusion can look at the program, understand what's going on, and even modify it. Sites implemented in ColdFusion can realize significant savings in program maintenance costs over the life of the application.
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Prototyping and Rapid Development
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When a developer interacts with a potential client, the client may have only a general idea of what he or she wants from the Web site. The power and compactness of the Coldfusion language make it ideal for quickly prototyping the "look and feel" of the site to show to the client. Using Coldfusion, the developer can easily:
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Outsource_Prototyping and Rapid Development Design, create, and populate prototype databases if none exist.
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Outsource_Prototyping and Rapid Development Interface, extract, and manipulate existing legacy databases to build prototype versions.
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Outsource_Prototyping and Rapid Development Build dynamic-content Web pages using drill-down or other techniques.
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It's a simple matter to put together such a prototype, deploy it, then demonstrate it in the client's office, or even over the phone. So, from a developer's point of view, Coldfusion helps to determine the clients' needs and demonstrate a prototype solution without investing a lot of time and dollars. And you, as the potential developer, get to "Strut your stuff".