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