For a physical Data Flow Diagram you explore into the logical DFD. for example, if you have a data flow arrow declared as "customer information" now the physical DFD would include in that data flow arrow "customer information = customer_name + customer_address". something along these lines
Physical DFD shows how various functions are performed and who does them but Logical DFD strips away all physical constraints but does not restrict physical happenings from taking place.
A Physical Data Flow Diagram is a diagram showing howparticular functions are performed within the data flow as opposed to a Logical DFD which only shows what functions are performed.
yes
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I have dfd for airlines reservation system. my email id is: nabanita.dumdum@gmail.com
"If you go through a Kendall and Kendall's Book it shows Context Level and Zero "0" Level as a different level DFD. According to Book by James A. Senn Both are same.So, Whatever method you follow just mention the reference you have taken from that book.From my point of view James A. Senn's book have clear and Correct approach toward DFD."Ref: dataflowdiagram.blogspot.in/2010/04/common-mistakes-in-dfd.htmlThe level 1, called context DFD, shows the whole system in one process. Level 2 focuses more closely on one particular process in level 1, and level 3 focuses on a single process from level 2.
difference between physical and logical data flow diagrams.
the dfd which independent view of the system is called logical dfd
A logical DFD makes it easier to communicate for the employees of an organization, leads to more stable systems, allows for better understanding of the system by analysts, is flexible and easy to maintain, and allows the user to remove redundancies easily. On the other hand, a physical DFD is clear on division between manual and automated processes, gives detailed description of processes, identifies temporary data stores, and adds more controls to make the system more efficient and simple. simply put… 1. Logical DFDs are not concerned about how the system is or will be constructed while Physical DFDs show how the system is or will be constructed. 2. Physical DFDs are more realistic and complex while Logical DFDs are simpler but provide an easier understanding view
A Physical Data Flow Diagram is a diagram showing howparticular functions are performed within the data flow as opposed to a Logical DFD which only shows what functions are performed.
dfd0 is a bigger scope in less detail than dfd1 which is much more detailed
context diagram, logical level 0 diagram and logical level 1 diagrams
actually dfd is used to define how data flow from one process to another process where as er diagram is used to define relation between different entities.
yes
DFD basically describe the flow of data, means how data can be flow in a system where as ERD defines the relationship between entities. -> There is no such constrainst like cardinality,participation in dfd as compare to Erd.. ->In DFD, we show the storage of file using Parallel line where as ERD is just a conceptual represantation of data... ATUL
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DFD for inline tourism
Hospital dfd