Blog: CS403 ASSIGNMENT NO.1 Solution Idea

Data Flow Diagram (DFD)
Data flow diagram (DFD) represents the flows of data between different processes in a business. It is a graphical technique that depicts information flow and the transforms that are applied as data move form input to output.
Context Diagrams
A context diagram is a top level (also known as Level 0) data flow diagram. It only contains one process node (process 0) that generalizes the function of the entire system in relationship to external entities.
Level 1 data flow diagram is the refinement of the context (0-level) data flow diagram. All the external entities are the same; however, the process is further elaborated by the other processes

The level of detail. The Level 1 shows the whole system. Level 2 focus more closely on one particular process in the level 1, and the level 3 focuses on a single process from a level 2.

Objectives
The objectives of this assignment are,
1. Giving the idea of the most common tool used for designing database systems i.e. Data Flow Diagram. It is used to design systems graphically and expresses different details of system in different DFD levels.
2. To become familiar with the flow of data between different processes and to hide complexities in any given system.
Assignment
Introduction:
In this course we are going to develop a complete physical database for “Trade Management System” that will computerize all the necessary Trade Management processes for a small business shop, BEST Mart. For this we will divide this whole project in small 4 to 5 assignment chunks and will try to cover every phase of database development life cycle from scratch to execution. Scenario for the Trade Management System is given below.
There exists a BEST Mart- a shopping centre, whose owner wants to computerize his business by developing Trade Management System. For this, owner hires a Database Administrator and put up a real world scenario and requirements as given below:
Trade Management System permits users to proficiently initiate and evaluate the process of requirement for the BEST Mart. Procedure begins when a client comes to BEST Mart, selects the cart and place the things in cart and goes towards salesman. The salesman examines the code of each selected item. On entry system will display invoice with some details like name of the product, its related magnitude/quantity and total sales line items along with total bill. After placing order, client will ahead to accountant counter to pay bill.
Trade Management System will support both types of customers, Registered and Non-Register. For Registered customers it is necessary for system to check whether he/she is on credit bases or not. For non-registered customers, it must have to be registered only by the Owner of the BEST Mart. Information about number of creditors and debtors are
known by the accounts department.
System will show flexibility in a sense that it should accept all payment methods i.e.
cash, credit and cash with credit.
Same is the scenario with Administrator/Owner of BEST Mart to purchase items from
different vendors on cash, credit or combination of two. The stock department and Sale
department will need to generate reports about stock status sale in different time span.
Task Description:
This Assignment is starting phase and in this assignment you will focus only on the
tasks given below:
1. You are required to identify all the processes in the system.
2. You are required to mention all the data stores in which data is stored.
3. Find out all the external entities interacting with the system
4. Create a Context level DFD
5. Create a level zero DFD
6. Create a detailed DFD of every process if needed

Same wohi kuch ha jo k is assignment me ha ab is ka solution dekhin

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