Author Topic: Data Flow Diagram's (Read 11382 times)

Ant · « **on:** 2001-12-01 10:39:00 »

Does anyone know what a DFD would look like for a store such as Amazon, and also an auction house such as eBay.
Im really crap at doing em!

Ta

--
Ant

Jedimark · « **Reply #1 on:** 2001-12-04 16:25:00 »

Whoa a data flow diagram for Amazon would be huge! It would have loads of levels. At level 0 you would have:

Customer (entity) -------> Amazon (process) <------- Supplier (entity)

Then you would have to split up Amazon System into various levels including Buying / Selling / Refunds / Customer Accounts / Special Offers / Supplier Accounts etc..... that would be a nightmare!

Darkness · « **Reply #2 on:** 2001-12-05 01:16:00 »

Customer -> HTML -> CGI Scripts -> Management/Processing -> Shipping?

Ant · « **Reply #3 on:** 2001-12-05 08:08:00 »

I'd done the context diagram but yeah you're right its gonna be a bloody nightmare.

Jedimark · « **Reply #4 on:** 2001-12-05 08:19:00 »

What do you need it for?

Ant · « **Reply #5 on:** 2001-12-05 11:14:00 »

A2 Computing Coursework.

For the analysis part I need to put in DFD's for current system (eBay) and new system (ECommerce store)

Ive done the store one, just need to do the auction DFD now.

Jedimark · « **Reply #6 on:** 2001-12-05 16:00:00 »

Wow.... what Syllabus are you doing? Im doing A2 Computing with Edexcell and the only Data Flow Diagrams I have to do are that of a very simple system for example I am doing Library System.

Ant · « **Reply #7 on:** 2001-12-05 16:29:00 »

Jedimark · « **Reply #8 on:** 2001-12-05 18:23:00 »

ah... the cursed AQA. Well EdExcell is relatively easy, but at the moment we are programming in assembly language :weep: and I hate it! I can't see the point in doing it either.... :isee:

Ant · « **Reply #9 on:** 2001-12-05 19:42:00 »

Ah man tell me about it. We had to do a bit of that even tho it doesn't really feature in the course.

ficedula · « **Reply #10 on:** 2001-12-05 19:50:00 »

Hey, don't knock assembler

It does form the basis for doing *everything* on the computer, so it's not too surprising they want you to know at least a bit about it.

Still gets used nowadays too, remember ... you wouldn't seriously write a whole program in assembler but it can be useful to know it for optimising extremely important code.

Jedimark · « **Reply #11 on:** 2001-12-05 20:04:00 »

Yeah yeah.... your sounding like my computing teacher now. But it gets so confusing because it doesn't have sub procedures etc.... you end up with a list of jumps... and jumps within jumps..... and trying to debug it is a nightmare. But yeah it does give you an insight into how the CPU opperates etc. Kinda puts Visual Basic into perspective.... it's a womans laguage compared to Assembly

mirex · « **Reply #12 on:** 2001-12-06 12:29:00 »

What do you mean by 'womans language' ? That women are something less ? hm ?

There are procedures in assembly, with call and ret. But youre right, it is all messy. But it is good language anyhow.

Darkness · « **Reply #13 on:** 2001-12-11 01:40:00 »

where can i go about getting an assembly compiler type thing? im learning 16bit right now....

mirex · « **Reply #14 on:** 2001-12-11 11:45:00 »

Try your school, or net. I was working with Turbo Assembler and it was good.

tip: google

Darkness · « **Reply #15 on:** 2001-12-11 11:58:00 »

mirex-> how could i forget?