The information system is one of today's most critical links within the value creation chain of an enterprise. It is one of the most critical links because it is closely intertwined with the performances of a company in respect of its ability to evolve and adapt to the market and regulation requirements.

An efficient information system is able to assess its portfolio of applications as for its ability to evolve and its global operational and maintenance costs. The ability of a portfolio to evolve requires a perfect knowledge of its components and the way they are related to one another, at the functional level (management rules) or at the technical level (links between components).

Knowing one's portfolio of applications in order to be reactive and efficient at a fair cost is a competitiveness factor that heavily matters to enterprises.

This knowledge of the legacy system is the foundation of any project related to the information system and its evolution ; it provides decision making elements that are critical to any large project of an information system department:

• Information system governance
• Mass changes
• Sub-contracting and outsourcing
• Integration of new regulations
• Integration of new architectures
• Management of the risk of a portfolio of applications

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