RE processes, 2013 Slide 1

Requirements engineering processes

Ian Sommerville

http://www.youtube.com/watch?v=GSe4xIy-iBE

RE processes, 2013 Slide 2

• There are different ways to look at the processes involved in requirements engineering

RE processes, 2013 Slide 3

The systems engineering process

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Requirements engineering• RE is not a separate and distinct process

that is carried out at the beginning of the software development life cycle

• Requirements may be developed as part of the system acquisition or procurement process

• Requirements are refined and new requirements emerge during system design and implementation

RE processes, 2013 Slide 5

RE process context

RE processes, 2013 Slide 6

RE process inputs and outputs

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RE process activities

RE processes, 2013 Slide 8

RE process iteration

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• Go round spiral until you run out of time for requirements engineering

• RE is always time constrained

• Problems with requirements arise because not enough time is allowed for the process

RE processes, 2013 Slide 10

Summary

• There are a number of different ways to look at requirements engineering

• These present different views of the goals and activities in requirements engineering

RE processes, 2013 Slide 11

RE perspectives

• Systems engineering

• Other procurements and design processes

• Inputs and outputs

• Activities

• Iteration