An ER diagram is used for any Hotel Management system is very easy b/c first of all we have to make an chart that which things are required in any hotel ?
database programming
data flow diagram for hotel management system
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E.R diagram of hotel
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To draw a data flow chart you should start at the top and work your way down. The CEO or President should be listed first, followed by whoever is the next highest title.
answer
component diagram for library managment system
Maybe it does not exist just for hotel management. However, you may want to take a look at the more widespread general DFD design tools such as the free Dia (http://live.gnome.org/Dia) or the commercial Visio (http://en.wikipedia.org/wiki/Microsoft_Visio).