Question

Requirements for Online

Ordering SystemAt home page A custom search option with suggestions and quick search links. A easy to follow navigation pane/bar. A cart option to easily view/modify the bought items.At checkout page Interface for coupon inclusion according to the order type and quantity. Increment, decrement (+/-) buttons to increase/decrease the order quantity for respective items. Options to choose between the various payment options.At order completion page Order confirmation message. Track order status link. Delivery date.

1. Draw Context Diagram based on Requirements from

2. Draw Level-0 Diagram based on Requirements from

Answer 1

As per the question we have drawn DFD for Online Ordering System,

Let’s see shortly what DFD is,

Graphical representation of the flow of data from one component to another component in the information system. We can overview of the system without going in detail of system.

There are some rules for drawing DFD:

Rules:

1. Process must have at least one input and output.

2. Data share must have at least one data flow in and one data flow out.

3. Data must be stored somewhere.

Types of DFD:

1. Context level/0 level

2. Level 1

3. Level 2

4. Level 3

Let’s see the Context level diagram for Online Ordering system:

Level 1 for Online Ordering system:

As per above DFD we can see overview of Online Ordering system.