Senior managers need summary inform

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 or the number of hours logged on Tuesday by each employee.
Production or service workers actually produce the product and deliver the service. Production workers need access to information from production machines. Service workers need access to customer records so they can take orders and answer questions from customers.