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Extension

When time goes by, existing software might be not supportive enough to current need. This doesn't mean the original design is poor. It means this project is practical and need evolve. Starting-up a brand new project is kind of waste in cumulated brain power and robust test. Extensions and add-on’s may contain old and unnecessary functionalities, but it make the projects growth with enterprise with stability.

When developers take over an old project, it seems cool to throw it out. But while doing so, your company lose existing and stable support, and you lose a chance to learn from other's wisdoms. There are only two conditions that a developer throws away old code rather than improvement: it was developed by a new learner, or it is too sophisticated so that the developer couldn't understand.
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