Hotel Reservation System Data Flow Diagram (dfd) a thorough explanation is provided for the example data flow diagram for hotel reservation system

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Hotel Reservation System Data Flow Diagram 
(DFD) 
A thorough explanation is provided for the example 
data flow diagram for hotel 
reservation system
. This example emphasizes the three 
DFD levels (DFD Levels 0, 1, and 2)
. 
Level 0 DFD for Hotel Reservation System 
The context diagram is an alternative name for the 
Level 0 DFD Diagram for Hotel 
Reservation System
. Users, the main process, and data flow make up its parts. Also, the project 
concept is demonstrated using the single process visualization. 
DFD Level 0 shows the entities that interact with a system and defines the border between 
the system and its environment. This diagram also depicts the hotel reservation system at a high 
level. 
Level 0 DFD for Hotel Reservation System
The illustration presents the main process in a single node to introduce the project context. 
This context explains how the project works in just one look. The user feeds data into the system 
and then receives the output from it. 
In addition to this, you will perceive through the diagram that there is already the presence 
of data flow. Though the process is very general, the flow of data is clear. Nevertheless, just modify 
this diagram to meet the other requirements and include other matters regarding hotel reservations. 
 
 

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Hotel Reservation System DFD Level 1 
The "detonated view" of the context diagram is 
Hotel Reservation
System
DFD Level 1
. 
Its function is to deepen the concept derive from the context diagram. 
Specifically, level 1 shows the broader details of Hotel Reservation System DFD Level 0. 
This is to clarify the paths (flow) of data and its transformation from input to output. 
Hotel Reservation System DFD Level 1
The designed diagram portrays four different scenarios: customer information 
management, reservation records management, reservation status monitoring, and transaction 
management. 
Firstly, the flow of data starts from the hotel admin, crews, and customers. Then the system 
caters to the transaction. This idea was based on hotel reservation processes. 

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You can also see the data store used or the database. The database is also used in storing 
users' data inputs. Then it serves as the source of outputs. 
Hotel Reservation System DFD Level 2 
 
Level 2 DFD for Hotel Reservation System
is also the highest abstraction of the data 
flow diagram. This level also broadens the idea from the DFD level 1. It includes the sub-processes 
from level 1 as well as the data that flows.
Hotel Reservation System DFD Level 2
However, not all of the processes in the project must have sub-processes. Only provide this 
diagram if needed. As long as your previous diagrams were clear and precise, this level is not 
required. 
You can add more to this and it is up to you how will you create your data flow diagram. 
Also, consider the data flow included and be precise with your information.