Databases Reference
In-Depth Information
An Introduction to Conceptual
Modeling of Information Systems
Antoni Olivé
2.1
The Functions of an Information System
The concept information system began to emerge around 1960. Even though
it may be considered an old concept, it is still difficult to define what an IS is.
Part of that difficulty is because ISs can be analyzed in at least three distinct
and complementary perspectives [1]:
The contribution they provide;
·
Their structure and behavior;
·
The functions they perform.
·
From the first perspective, ISs are defined as means for wider systems to
achieve their objectives. That kind of definition emphasizes that ISs are sub-
systems of wider systems, to which they contribute. An IS does not exist for
itself. Examples of that kind of definition would be: An IS is a system
designed to support operations, management, and decision-making in an
organization or An IS is a system that facilitates communication among
its users.
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