Senior managers need summary information that quickly informs them about the overall performance of the firm,
Middle managers need more specific information on the results of specific functional areas and departments of the firm, such as sales contacts by the sales force
Knowledge workers, such as engineers, scientists, or architects, design products or services They may need access to external scientific databases or internal databases with organizational knowledge.
Operational managers need transaction-level information, such as the number of parts in inventory each day
Production or service workers actually produce the product and deliver the service.