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Do you use standard software from the major manufacturers? If you do, this surely operates perfectly and follows a well-organised procedure which may look like this:
Release deliveries are provided every six months. However, you cannot make use of each release because you always have to make sure that your own specific business transactions still operate properly with the software. Probably, you only accept a release once a year or even every two years.
If you intend implementing a dynamic business model, your software requirements will have to be defined for the standard software provider. As a basis for calculating a possible time span, let us assume that an enhancement would take a programmer an additional four weeks to complete.
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