System development/Course/Data model

  • A data model describes tangible things in the real world. Like products, suppliers, customers, and orders.
  • Data items can have properties. A car for instance might have the following properties: license plate number, colour, model.
  • In learning project concepts you can find examples of data items and their properties.
  • All properties are of a certain data type.

How to make a data model?

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  • When you make a data model for your organisation you can ask how data is stored now. Sometimes people store information in Word or Excel.
  • In most organisations paper forms are used to get information.

Multiplicity

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TD: explain multiplicity in the advanced course