IS urbanization, what is it?
As defined by Wikipedia, the urbanization of the Information System of the enterprise is a set of constructs based on those of the urbanization of the human environment (organization of cities, land), notions that have been reused in computer modeling to formalize or re-engineering of Information System (IS). The planning rules and a set of coherent, stable and modular, which various stakeholders refer to any investment decision concerning the management of Information System.
Urbanism defines rules and a coherent, stable, modular, in which different stakeholders refer to any investment decision concerning the management Information System.
Principle Information System urbanization
Urbanization has two basic rules:
- An application must belong in -a target- and a single block.
- Dependencies must respect the notion of coherence Strong / weak coupling
- between applications,
- within an application: between the different modules,
- within a module: between the different components.
The term -target- defines the application that is sought to be. It opposes to the existing situation, theAs is. The method to switch from the current as-is to the to-be you want is called the roadmap (or roadmap).
The notion of Consistency High / Low coupling indicates that two applications must communicate with each other in a simple and effective, but that the dependency between these two applications is minimal (ideally none). This allows to remove a block to replace it without disturbing the rest of SI.
The Information System can be compared to a city neighborhood, if it is well built and very urbanized, it is possible to demolish a building in the heart without jeopardizing the entire area and replace or build another building, connecting the new building with different exchange networks: access roads, electricity, sewage, etc.. Urbanization is thus to create an agile, flexible and scalable IS.
Methodology
The process of urbanization is based on three key areas that feed each other:
- the modeling strategy
- the mapping of existing systems (business, functional, application, technical)
- the determination of target systems (business, functional, application, technical)
The process of urbanization of the IS includes:
- set a target IS, aligned to business strategy,
- determine the path to follow to achieve this target IS.
