POS (Point of Sales) System DFD Levels 0, 1, and 2
POS (Point of Sale) System DFD shows the overall movement of data inside the project. The DFD (Data Flow Diagram) main focus is to design the ways on how the system handle all the data included. The design done in Data Flow Diagram for POS (Point of Sales) System inform readers and programmers about how will the system handle the data in DFD Levels 0, 1and 2.
The DFD (Data Flow Diagram) for POS (Point of Sales) System has 3 major level which were the Level 0, 1 and 2. The level 0 (context diagram)shows the POS (Point of Sales) System general process design which is represented by a single process. Next is the POS (Point of Sales) System DFD Level 1 shown by a detonated view of the context diagram. It broadens the idea from level 1 to determine the included processes. While DFD Level 2 expands the knowledge from the level 1 by adding the system’s database.
Here’s what you need to know.
The Data Flow Diagram (DFD) represents the flow of data and the transformations in POS System. These transformations occurs as data enters and exits a system. In the DFD, input, processing, and output are used to represent and define the overall system.
The following are the data that the System modifies:
- Sales Information
- Customers Info
- Revenue Information
- Payment Records
- Vat Tax and Discounts
These data (input/output) can also be seen in other diagrams that builds the whole system. Since Systems were not just about the data inputs and outputs but also the processes and backbone structures. So to create a well-engineered POS (Point of Sale) System, aside from DFD Diagram you can also use diagrams that follows to furnish your project. We have:
- Point of Sale (POS) System Sequence Diagram
- POS (Point of Sale) System Use Case Diagram
- Point of Sales and Inventory System Database Design
Data Flow Diagram for POS (Point of Sales) System and its DFD Level 0, 1, and 2
Time needed: 10 minutes.
Here’s the Data Flow Diagram for POS (Point of Sales) System which explains the overall flow of data throughout the software in form of DFD levels 0, 1, and 2.
- POS (Point of Sales) System DFD Level 0 (Context Diagram)
The POS (Point of Sale) System level 0 (context diagram) represents the abstract view of the project in a single process with external parties. This level introduces to you the main function and basic concept of the project. The concept will help you understand the work of the project and the potential data that will roam the system.
This context diagram portrays the general process done in POS (Point of Sale) System. The general process is based on the concept of the proposed project and illustrated using the DFD symbols to visualize the idea. This will also serve as a guide as you go through the deeper processes of the POS (Point of Sale) system data flow diagrams.
- POS (Point of Sales) System DFD Level 1
Next to the context diagram is the level 1 data flow diagram. It contains the broadened concept of DFD Level 0. It’ll be done by determining the included processes to complete the basic idea from the context diagram. So as the processes were determined, data inputs will be specified as well as the outputs.
When the processes and data were all specified, you just have to plot the flow of data from the external entity (user) to the process up tp producing the output. With being knowledgeable about the DFD level 1 of the POS (Point of Sale) System, you will know then its broaden context terms.
In addition to that, this may also serve as your reference on how the inputs or data fed on the system. Then you will be also informed about the outputs that the system gives. The processes shown in the DFD were all based on the concept of POS (Point of Sale) System.
- POS (Point of Sales) System DFD Level 2
After presenting the point of sale system DFD levels 0 and 1, next to that is level 2. It is considered as the highest DFD abstraction because it completes the details needed for POS System.
The included processes and data were all revealed and to complete the whole POs (Point of Sale) System, you just have to add the database that will be emphasized in DFD Level 2. The database serves as the storage of the data that will part of the system.
DFD level 2 let’s you know the ideas on where does the data inputs goes and inputs comes within the Point of Sale System.
The presented level not only shows you the detailed processes of system, but also gives you precise destination of the data that flows in the system.
Considering the the dataflow levels mentioned above, you can determine well the importance of breaking the processes into more specific manner.
Additional Knowledge on Point of Sales (POS) System DFD Levels 0, 1, and 2
Point of Sales (POS) System DFD level 0
DFD level 0 is also known as context diagram. It is an abstract view using the mechanism represented as a single process with external parties. The data flow diagram level 0 also considers the entire system to be a single process and emphasizes the system’s interaction with external entities.
The only thing that you should bear in mind in building the POS System DFD Level 0 is to think of what is the main goal of the project. Then finalize the main users and the data that will be utilized when using the project. Last is to plot a scenario where there is an exchange data between the users and the system.
Point of Sales (POS) System DFD level 1
DFD Level 1 portrays a broad overview of the context diagram. It goes deeper into the idea presented in the context diagram then presents the sub-processes that completes the main process.
As the processes gets more specific, the flow of data in each process were also specified. This is to reveal the origin of the data and its destination. Note that DFD Level 1 only specified the processes and you could still emphasize its sub-processes in DFD Level 2. Just make sure that they are all understandable and well-explained.
Point of Sales (POS) System DFD level 2
DFD Level 2 is the highest abstraction level and represents the system databases used. It delves even deeper into the concepts of DFD Level 1. It can be used to plan or record all of the specific/necessary information about how the system works. The POS System DFD Level 2 is the completed data flow diagram illustration.
This level completes the whole data management from the user inputs, processing it, storing it in the database and giving the appropriate output to the users. That’s how the Whole Data flow Diagram works.
So that completes our discussion fellas! And I hope that this PDF about POS (Point of Sales) System Data Flow Diagram Levels 0 1 2 | Best DFD 2021 will help you a lot.
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