Data flow diagrams

Marina89 · 19 Oct 2009, 2:25 PM

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I'm looking over a data flow diagram for the school timetable system in the Samuel Davis book and it has 'Admin staff' as an external entity. I thought that participants are part of the system and therefore they aren't considered to be an external entity..

Someone please explain?

Lwaxana · 19 Oct 2009, 9:49 PM

External entity = any person or organisation that sends data to or receives data from the system

Kat92 · 20 Oct 2009, 11:09 AM

Yes, data flows can go both forward and backwards.

alcalder · 20 Oct 2009, 12:28 PM

Not that I have the diagram in front of me, but also you need to remember that the making of such diagrams also includes a lot of internal politics. School timetabling is usually done by the AP or VP and teaching staff below him. Admin staff are just adjuncts to the school and are seen as such by most on the teaching side of things.

Others (like you and me) know and understand that the Admin staff are actually the heart and soul of a school and SHOULD be included in the whole of such a data flow diagram because they are the ones who input, output, implement, formulate, distribute etc the most.

Marina89 · 21 Oct 2009, 10:32 AM

Ok that makes sense. Thanks guys =)

19 Oct 2009, 2:25 PM	#1 (permalink)
Marina89 Junior Member HSC: 2009 Gender: Female Join Date: Mar 2009 Posts: 46 Last Activity: 11 Nov 2009, 10:48 PM	Data flow diagrams You can hide this advertisement by registering. I'm looking over a data flow diagram for the school timetable system in the Samuel Davis book and it has 'Admin staff' as an external entity. I thought that participants are part of the system and therefore they aren't considered to be an external entity.. Someone please explain? __________________ Advanced English Maths 2 unit Chemistry Business Studies I.P.T Last edited by Marina89; 19 Oct 2009 at 3:19 PM. Reason: EDIT - also, can the data arrows go in both directions from an external entity to a process (and back again)

19 Oct 2009, 9:49 PM	#2 (permalink)
Lwaxana Betazed Ambassador Senior Advisor HSC: N/A Gender: Female Location: in a galaxy far far away Join Date: Oct 2002 Posts: 384 Last Activity: 12 Nov 2009, 8:39 PM	Re: Data flow diagrams External entity = any person or organisation that sends data to or receives data from the system

20 Oct 2009, 11:09 AM	#3 (permalink)
Kat92 Assistant Member HSC: 2009 Gender: Female Join Date: Oct 2008 Posts: 75 Last Activity: Yesterday, 1:49 PM	Re: Data flow diagrams Yes, data flows can go both forward and backwards.

20 Oct 2009, 12:28 PM	#4 (permalink)
alcalder Just ask for help HSC: N/A Gender: Female Location: Sydney Join Date: Jun 2006 Posts: 527 Last Activity: 20 Nov 2009, 3:21 PM	Re: Data flow diagrams Not that I have the diagram in front of me, but also you need to remember that the making of such diagrams also includes a lot of internal politics. School timetabling is usually done by the AP or VP and teaching staff below him. Admin staff are just adjuncts to the school and are seen as such by most on the teaching side of things. Others (like you and me) know and understand that the Admin staff are actually the heart and soul of a school and SHOULD be included in the whole of such a data flow diagram because they are the ones who input, output, implement, formulate, distribute etc the most. __________________ Life is more than education. Get out and have some fun! Author, BE(Elec)Hon, DipLang(German), GradDipEd, Elec Engineer, Ex Science/Physics/Maths to Ext2/IT/German Teacher - HOMESCHOOLING

21 Oct 2009, 10:32 AM	#5 (permalink)
Marina89 Junior Member HSC: 2009 Gender: Female Join Date: Mar 2009 Posts: 46 Last Activity: 11 Nov 2009, 10:48 PM	Re: Data flow diagrams Ok that makes sense. Thanks guys =) __________________ Advanced English Maths 2 unit Chemistry Business Studies I.P.T

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