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Online ordering and inventory system

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par Jean Claude KANYESHYAMBA
INILAK - Bachelor's degree 2012

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4.5.3 Data Flow Diagram

DFD is a graphical representation of the «flow» of data through an information system. DFDs can also be used for the visualization of data processing (structured design). On a DFD, data items flow from an external data source or an internal data store to an internal data store or an external data sink, via an internal process.

It is common practice for a designer to draw a context-level DFD first which shows the interaction between the system and outside entities. This context-level DFD is then «exploded» to show more detail of the system being modeled. With a dataflow diagram, users are able to visualize how the system will operate, what the system will accomplish and how the system will be implemented. Dataflow diagrams can be used to provide the end user with a physical idea of where the data they input , ultimately has an effect upon the structure of the whole system from order to dispatch to restock how any system is developed can be determined through a dataflow diagram. In my case DFD will be the intermediate of analyst and user of this system how the customers make order up delivering date.

4.5.4 Context diagram

Is a diagram that represents the actors outside a system that could interact with that system, This diagram is the highest level view of a system, similar to Block diagram, showing a possibly software-based, system as a whole and its inputs and outputs from/ to external factors.

In our case, external entities are the customers who will need the various services from the system, and the Administration office who will request the reports.

v From customer to the system: the system will provide information using online system and customer access it without changing anything and customer choosing the product and send order to the system, the system accept or refuse, when the system accept it send to him an invoice, the customer pay according to the invoice after the system give to him delivery date of the product ordered.

v From administrator to the system: administrator requests reports to the system and the system provide the report requested.

The detail information is presented in context diagram below:

Figure 2: Context Diagram DFD level 0 for whole OOIS

Figure 3: DFD level 0 for whole OOIS DFD level 1 for manage product

Figure 4: DFD level 1 for manage product DFD level1 for manage customers

Figure 5: DFD level1 for manage customers

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