M2 - you need to identify the information systems used in
a specified organisation.
To achieve M2 you must choose a specific
area of the school (e.g. sixth form) and illustrate the input
and output of information within two specific tasks carried
out.
To do this you need to create two data flow diagrams
(DFDs) explaining the input and output of information within your two
departments. You must check each process to ensure that you have used the
industry recognised symbols and correct
errors.
External Entity
An external entity can represent a human, system or subsystem. It is where certain data comes from or goes to. It is external to the system we study, in terms of the business process. For this reason, people use to draw external entities on the edge of a diagram.
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Process
A process is a business activity or function where the manipulation and transformation of data takes place. A process can be decomposed to finer level of details, for representing how data is being processed within the process.
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Data Store
A data store represents the storage of persistent data required and/or produced by the process. Here are some examples of data stores: membership forms, database table, etc.
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