Rapid Implementation Methodology
It's a sad but well-known fact that many software implementation projects run out of time and money. Certain crucial activities tend to have striking effects on

maintenance methodology  the extra development Additional maintenance cost, around 25% of the initial cost of the modification is typical, and this is an annual cost There is much less critical mass of knowledge about the modification - a likely scenario might be that the guy ordering/using it and the software engineer creating it both resigned, and nobody else knows that much about it... Additional cost is induced every time you upgrade, including the risk of disturbing quality of the standard software while migrating the mod

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