Optimizing the process of implementing a new corporative system to the end user

The process of migrating from one corporative product to another has some difficulties. Especially, these issues are noticeable if the outdated system worked for a long period of time; it stores a great amount of data, which need to be transferred to the new system. Sometimes the data formats are fully incompatible. In most cases data migration is possible; however there is no way to move data from old to new system completely. This paper describes the intermediate period, when the new system is being implemented and the old system is being retired. Two approaches of organizing the system replacement process are suggested on condition that the old data will be entirely saved to new system: parallel exploitation of outdated and new systems and preliminary data conversion.