data flow diagrams M1

high data flow diagram

click here to see an example of a high data flow diagram

a high data flow diagram gives a basic idea on the flow of data. in the example of a data flow diagram I have given, I have used three external sources of data. the ones I have used in my data flow diagram are customer and manufacturers. an external source is when information comes from a source that is outside of your business. an example of an external source is when a customer buys a product. this is external because the customer is giving you information and they are not a part of your business. the internal sources I have used in my data flow diagram are shop, manager and accounts. an internal source of data is data that has come from a source inside your business. an example of this is the shop buying stock. this is internal because the data is coming from the shop which is an internal source.
in the center of the data flow diagram you must include the process. this is the main part of a data flow diagram as it shows people what is happening to the data. in the center of my data flow diagram I have used the process 'purchasing stock'.

what is happening in my high data flow diagram?

1. first the customer buys a product. this data goes through the process purchasing stock.

2. next the order details will come to the shop. this will include information such as how much the customer has purchased and how much money the customer has spent. this will then allow them to make a stock check and see how much stock they will need to purchase 

3.next the customer will receive the product they have brought

4. after that the shop will place an order for new stock to replace all the stock that has either gone past its sell by date or has been sold

5. payment details will then go to the accounts so they know how much money they are spending on the new stock.

6. money will then come out of the accounts and will be given to the manufacturers of the stock.

7. order details will then go to the manufactures so they know how much new stock they need to supply to the shop.

8 finally the shop will receive the new stock to the cycle can continue again.

low level data flow diagram 

click here to see an example of a low data flow diagram

a low level data flow diagram is similar to a high level accept it goes into more detail about what is happening in between the flow of the information.

what is happening in my low level data flow diagram?

1. first the customer buys a product similar to the high level data flow diagram.

2. the shop then calculates the payment so that the correct amount of money is charged for the product.

3. next the order details will come to the shop.

4. next the shop will create a report on all the stock sold and all the money made. this report will be surmised and sent to the manager so they can make important business decisions on how much stock needs to be purchased and what stock should be purchased (if a specific piece of stock is not selling well then they will not continue to replace that stock).

5. the shop will then order new stock. 

the payment details will be sent to accounts. they will then check how much money is being spent on the new stock

6 money will then come out of accounts and will be given to the manufacturers of the products.

7. order details will then be given to the manufacturers so they know how much stock they need to produce.

8. the shop will then receive the new stock details along with the stock details.