Ie there is a big time lag between the time of introduction of various systems or point changes in business processes and the change of eva. Thus, the positive financial effect resulting from the object of our research, might be hiding behind a completely unrelated financial problems – change in market conditions, market conditions, etc. Read more from Phil Vasan to gain a more clear picture of the situation. eva methodology can be applied both to evaluate individual project to reform the banking information system (for example, the introduction of CRM), and to assess effectiveness of the processes of transformation of the it infrastructure as a whole. In this case, the total cost of enterprise's it infrastructure are calculated using the method of tco. The total economic effect (Total Economic Impact, TEI) – a heterogeneous methodology which was developed by Forrester Research. It allows you to evaluate project implementation component of the enterprise information system in terms of three indicators – "Price", "Benefits" and "flexibility." "Cost" is calculated by the method of "Total Cost of Ownership (TCO) and is the only quantitative assessment of this technique. "Benefits" and "flexibility" are estimates of good quality. "Benefits" give to judge the opportunity to introduce the product line or a component information system requirements of the project implementation. Additional features that will appear in the work of staff Company on the basis of the implementation of such component or product must be evaluated both in terms of growth performance and on their influence on the identified operational and technological risks. "Flexibility" in this methodology seen as an indicator, which characterizes the complexity of the implementation process.