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?

• 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

TD: explain multiplicity in the advanced course