are there any rules to follow when creating a flowchart as with data flow diagrams?what are they??

Question

this question is under information systems developement.

Answer 1

http://en.wikipedia.org/wiki/Flowchart

Generally, flowcharts are much easier to make than DFDs exactly for the reason that there aren't so many rules to remember.

Answer 2

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Answer 3

Yas there are. The information movement needs to flow from initialising the sequence to its completion. Hence "Data Flow". Its a lot easier than actually writing the programme though as its basically a series of diagrams and arrows. You just need to be methodical and go from Start (Usually data input) to finish via your own arrangement of file storage/ manipulation/ print out/ etc. If you go to a good stationers you can purchase a data flow template that will make your hand in look so much neater than the freehand variety. However if you can't get hold of one then there are ready made diagrams in the drawing section of your computer.

Answer 4

Someone said flow charts are easier than DFDs, but I have never seen a real world problem that needs modelling by flow charts.

Flow charts follow very basic computer logic (so they have little use in modern computer design because they work at a very low level). You have the following items in a standard flow chart. Start/End, Input/Output, Process, and Decision.

Like DFDs you don't have to follow other people's exact models. For example, if you are modelling the flow for a user interface you might have decision boxes that let you branch off into multi directions.