I am stuck on Strategic Information Systems.

1. What are the different types of information systems used at different levels of the organisation?
2. What are the information needs at these different levels within an organisation? Evaluate the suitability of these information systems for the different functional areas of the organisation?
3. What are the types of information systems that are used within all levels of an organisation?
4. What do these different types of information systems do?
5. What are these different types of information systems?

These are the Types of Information Systems I have to talk about:

1. Business information systems,
2. Decision support systems,
3. Management information systems,
4. Executive information systems,
5. office information systems,
6. transaction processing systems,
7. expert systems,
8. global information systems,
9. data warehouse systems,
10. enterprise systems,
11. enterprise resource
12. planning systems,
13. integrated information systems.