Tools of Analysis (part 6 of 8) - Process & Data (DFD / Data Flow Diagram)
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We need this tutor in Bolton uni ours is dumb and trying to show her self number one tutor. for system analysis. tnx ur lecture sud be awesome .
Thanks for this video
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Depends, the data read can be used for other functions down the line. An example is given in this video, with process "Send invoices" having read-only access to the "Invoices" datastore, as indicated by the arrow leading away from the datastore rather than to it.
I just felt I should comment on that dual nature given that he describes processes as entities that mutate data earlier on in the video.
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very,,,,, good explanation
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External entity must be circle and process must be Rectangle..
mahinthan5 1 week ago in playlist More videos from gvimontslice
@mahinthan5 Dr. Langer is using the Yourdon/DeMarco method for data flow diagrams. In this case, the external symbol is a rectangle and the process symbol is a circle or ellipse.
gvimontslice 1 week ago
i believe that when placing a data flow you must label the data flow
m33taphor 8 months ago
@m33taphor The convention for Yourdon/DeMarco DFD symbols is to only name explicitly the flows between externals and processes and those that flow among processes. Notice that these types of flow are uni-directional, thus the name will be clear as to the aggregation of data elements within each uniquely named flow.
gvimontslice 8 months ago
@m33taphor The convention for data stores is to leave these un-named because these may be bi-directional (read/write) and the details of what is being read and written will be defined within the process specification.
gvimontslice 8 months ago
1:10 yes, but reading data rather than writing it can be a process too.
CorporateG0th 10 months ago
@CorporateG0th -- It can be challenging to differentiate between business processes and intrinsic systemic services. DFDs are most useful in modeling flows of information (in the form of data elements) among processes and between their related sources (points of origin) and sinks (targets). The bottom line remains, if the data is not changed or manipulated in some manner, there really is no meaningful process.
gvimontslice 9 months ago