Assignment No. 01
Total Marks: 20
Deadline date:
Your assignment must be uploaded / submitted before or on October 19, 2009.
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1. Read the problem description carefully looking for:
· People / Organizations / Things that supply information to or use information from the system => external entities (EE)
· Actions / Doing words / Verbs => Processes (P)
· Movement / Exchange of information / Data between external entities to processes, and processes to processes => data flows (DF)
· Store / Record information / Data => data stores(DS)
2. It often helps to walk through the system in its logical sequence; eg starting with an external entity (source), add data flows, processes and data stores as the data provided by the entity is manipulated by the system.
Assignment
Draw a Context as well as Level 0 Data Flow Diagram (DFD) of a Shop Sale Management System for a company sailing shops in different parts of country. The Shop Sale Management System works as follows:
Ø Customer Places order. System checks availability of the customer in customer file (If he / she is already a customer). If found, then approved otherwise a new customer is created. Here new customer’s info is sent to ledger file.
Ø Then the availability of shops is checked in the stock. If found, an Invoice is generated. Invoice info is sent to the customer, stock, ledger as well as sales department.
Ø If shop is not available at this time, then this info is also sent to the customer.
Purposes:
Ensure that you can analyze existing manual system and can draw Data Flow Diagrams of any proposed system.
Before Starting:
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