STOCK CONTROL SYSTEM - estimating the time needed to develop application. A company sells goods on the phone - if agents call the customers, customers call the

agents, and so on - business operates successfully, but there comes a time for putting the whole in order. There occurs a need for developing a system able to control the

whole stock, from orders to payments.

Following will be the 5 System Transaction Functions derived from an SRS:

1. External Inputs - customer, Order, Stock or Product, and payment details: 2. External Outputs - customer, order, stock details, credit rating:

3. External Inquiries - customer, order, and stock details.

4. Internal Logical Files - Customer, product or good, and customer bought good transactions or purchase. 5. External Interface Files - there's no EIFs to consider.

The total number of internal logical file tables are 3?