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?
[edit | edit source]- 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
[edit | edit source]TD: explain multiplicity in the advanced course