MIS $150,$ Inc. is a medium size financial service company located in Sacramento City. MIS $150$ offers selling$/$buying stocks and bonds to its customers. MIS $150$ hires competent, careful and hardworking brokers to perform the selling$/$buying transactions for customers. The management likes to have instant summary business information regarding customers, brokers, stocks, and bonds. The broker likes to track his$/$her sales, customers, stocks and bonds for improving sales volume and offering better customer services. The customer likes to have an instant report for his$/$her profits and the information of every stock and bond.

Develop an external level of three user views $($one for the top management, one for the broker and one for the customer$)$ in terms of customer information, performance of the stock and bond, broker's sales and profit information.

Combine the three users' external views into the conceptual level of one logical structure with appropriate interrelated relations, and corresponding attributes for the MIS $150$ database.