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Flashcards by Mokshaguru Saravanan, updated more than 1 year ago
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Created by Mokshaguru Saravanan
almost 5 years ago
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| Question | Answer |
| What is the aim of the context diagram? | To represent an overview of the system. |
| How do you draw a context diagram? | Draw a single process along with multiple inputs, outputs and external entities with data flow arrows. Each element should be labelled. |
| What are the symbols of a context diagram and what does each represent? | |
| An example of a context diagram that represents a voting system: | |
| What is the aim of the data flow diagram? | To represent a system as a number of processes that together form a single system. It is a refined context diagram and identified the flow of data. |
| How do you draw a data flow diagram? | The same way a context diagram is drawn, however, it may have multiple processes (marked by numbers) that can be broken down even further as well as one or more data stores. They may have an external entity but it is not a requirement. |
| What are the symbols of a data flow diagram and what does each represent? | |
| An example of a DFD that breaks down the voting system from the context diagram. | |
| What is the aim of the structure chart? | To represent a system by showing the separate modules or subroutines that make up the system and their relationship to each other. |
| How do you draw a structure chart? | Draw rectangles that represent modules or subroutines, and draw lines between them to show the connections between them. Other symbols (listed below), can be used to further explain the movement of data and any variables as well as decisions and repetitions that need to be made. All elements should be labelled. |
| What are the symbols of a structure chart and what does each represent? | |
| An example of a structure chart that represents a school library system | |
| What is the aim of the system flowchart? | To represent a system and show the flow of data, the separate modules that make up the system and the different types of media used. |
| How do you draw a system flowchart? | Draw any media type or process symbol and connect it to another using arrowed lines to indicate the flow. |
| What are the symbols of a system flowchart and what does each represent? | |
| An example of a system flowchart that is used to manage a doctor's patient information. |
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