Diagrams Flashcards
what are the different types of diagrams?
1) system diagrams
2) Data flow diagrams
3) process diagrams
Define a system diagram
These show the relationships between the various systems in the company // system diagrams are used to capture the nature of the current system. They are also used in the next ‘design’ stage to document how the new system will work.
Define a Data-Flow diagram
A data flow diagram is created to show how information flows from an input to an outcome (not always an output, as there may be many outputs, such as the parcels being delivered and an email being sent)
Define a process diagram
People handle information in a specific way - they have a ‘process’. For example, an employee makes an expense claim. First of all their manager counter-signs the claim. It then goes to the account manager who authorises payment and so on.
A process diagram will try to show these processes in action.
what is the first function and last function in a flowchart?
> input
output
what is after the input of a flowchart?
the process
what is an example of a data-flow diagram (DFD)
food ordering system
online shopping
what is an entity in a dfd
what/who is providing or recieving the data
what is the process of a system
the thing that is using the data
what is a data-store
where data is being held/stored (example - a database)
what is a information flow diagram?
the generally show information exchange between entitys
what is information?
data with meaning ( such as when processed
what is an example of a system diagram?
e.g. security of a data centre
>moniter
>gate sensors
> burglar alarms
> keyboard/mouse
>CCTV camera/footage
