Member Avatar for jbennet

Can someone who knows please explain to me the general idea of Level 0 and Level 1 DFD's?

I dont get it?

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Member Avatar for hbk619

and example level 1 dfd http://www.dcs.bbk.ac.uk/~steve/2_2/sld002.htm

attached is a help sheet i got from college one them.

Pretty much level 1 and 0 are how deep you go, level 1 is detailed 0 not so much. I think.

The level 1 diagram shows the main functional areas of the system under investigation. As with the context diagram, any system under investigation should be represented by only one level 1 diagram.

There is no formula that can be applied in deciding what is, and what is not, a level 1 process. Level 1 processes should describe only the main functional areas of the system, and you should avoid the temptation of including lower level processes on this diagram. As a general rule no business process diagram should contain more than 12 process boxes.

http://www.getahead-direct.com/gwbadfd.htm

if those help?

Data_flow_diagrams.doc (28.5 KB)
Member Avatar for jbennet

Thanks. I asked my computing teacher a bit and he said you dont show the datastores in LV0s apparently

Its for my A2 Computing coursework so ill go along to workshop and ask.

You do computing?

Member Avatar for hbk619

Best to ask a teacher lol, yup I do BTEC National ICT. tis good, we did that sorta for the Systems Analysis and Design unit.

Member Avatar for jbennet

"Serunson" does BTEC too i think

Member Avatar for hbk619

Yar, but I do the one above that hehe, he does the one thats equal to 2 alevels i think. Me get three from mine :)

Member Avatar for jbennet

ah i see, yeah he must do because he does electronics and physics too

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