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Northern IrelandSoftware Systems DevelopmentQuick questions
A2 1 Systems Approaches and Database Concepts
Quick questions on System modelling and UML: data flow diagrams, use case and class diagrams - CCEA A-Level Software Systems Development
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are data flow diagrams?Show answer
DFDs can be levelled: a context (level 0) diagram shows the whole system as one process with its external entities, and lower levels decompose each process into more detail. They give a clear, technology-independent view that helps communicate with users and check that all required data is accounted for.
What is the data dictionary?Show answer
A data dictionary is a catalogue describing every data item in the system: its name, data type, size/length, format, validation rules and description. It ensures everyone uses each item consistently and underpins both the DFD's data flows and the database design.
What is q1?Show answer
Name the four components of a data flow diagram. [4 marks]
What is q2?Show answer
State what a UML use case diagram shows and from whose point of view. [2 marks]
What is q3?Show answer
State two pieces of information recorded about a data item in a data dictionary. [2 marks]
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