Information Systems – Basics

Information Systems – Basics

The information systems (IS) are organized systems for the collection, organization, storage and communication of information.


Let us have a look at some basic definition.

Business Processes: the unique way in which organizations coordinate and organize work activities, information, and knowledge to produce a product or a service.

When you are a company that sells books, the process is like this:
book choice -> book purchase -> dispatching -> delivery.


The IS Model is composed by:

  • IT Model (how?),
  • Functional Model (what?),
  • Organizational Model (who?).

IS Model > IT Model

The IT Model is composed by:

  • Application Model,
    • Presentation Layer,
    • Business Rules Layer,
    • Data Layer;
  • Technological Model,
    • processing architecture (es. P2P, Client-Server),
    • network architecture (es. LAN, MAN, WAN).

IS Model > Functional Model

The Functional Model is composed by:

  • processes,
    • CRASO as tool to support business processes;
  • use cases
  • data

IS Model > Organizational Model

The Organizational Model can be represented with:

  • organizational chart
  • linear responsibility chart
  • swimline


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