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