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.

$1.$ 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.

$2.$ 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.