Go with the Flow (Part 3)

25 Feb

Go with the Flow (Part 3)

Hi there again, we are now half way there in terms of blog entries, goes quick doesn’t? So this week as promised Il explain what exactly a DFD is and what would its differences be against a ordinary flow chart. And just in case any of forgot DFD means Data Flow Diagram.

Okay think of it this way flow charts are the big oak and DFDs are the specific branch. So DFDs are specific to information systems as oppose to my example of getting out of bed back in part 1.

So think of the ATM example, buying cinema tickets, purchasing clothes online or scanners at shops

Now there is one more thing that makes DFDs unique to other flow charts. Its has similar symbols of flow charts in the entities, the processes and data flows. Now here is the unique difference in the DFDs you also have a symbol for data stores. This is for information systems that want to keep track off all data. Like buying products at online. Say “River Island” wanted to know which clothing was there most popular they could have an information system scanner in store and you would be able to buy it from scanning the item, and machine keep record of the individual item. Now the data is stored

There is type of DFD called Context DFD. It’s basically a mini DFD. It so people can take a quick glance at how the information system operates

Il explain more about DFD’s mechanics next week


4 Responses to “Go with the Flow (Part 3)”

  1. sad111468572 February 26, 2013 at 1:28 pm #

    well done group member. go with the flow is very interesting.

  2. sad111428658 February 26, 2013 at 1:33 pm #

    Cathal Doyle said the most inportant part of this assignment is to “enjot it” and to be honest i thought this blog writing/reading would be the boringest thing ever, But this blog was very intersting. Well done you won me over

  3. sad111510923 February 27, 2013 at 3:24 pm #

    I agree with sad 111428658.You really make your blogs interesting and you inspired me to start to make my blogs interesting also and just ‘enjoy’ them more 🙂

  4. sad111359681 February 28, 2013 at 1:06 pm #

    I must say this “go with the flow” blog is the best to date! It really stimulates my interest in the subject area and as well as being enjoyable I learnt something new! well done buddy

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