ch8 - Ian Sommerville 2000 Software Engineering, 6th...

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Unformatted text preview: Ian Sommerville 2000 Software Engineering, 6th edition. Chapter 8 Slide 1 Software Prototyping l Rapid software development to validate requirements Ian Sommerville 2000 Software Engineering, 6th edition. Chapter 8 Slide 2 Objectives l To describe the use of prototypes in different types of development project l To discuss evolutionary and throw-away prototyping l To introduce three rapid prototyping techniques - high-level language development, database programming and component reuse l To explain the need for user interface prototyping Ian Sommerville 2000 Software Engineering, 6th edition. Chapter 8 Slide 3 Topics covered l Prototyping in the software process l Prototyping techniques l User interface prototyping Ian Sommerville 2000 Software Engineering, 6th edition. Chapter 8 Slide 4 System prototyping l Prototyping is the rapid development of a system l In the past, the developed system was normally thought of as inferior in some way to the required system so further development was required l Now, the boundary between prototyping and normal system development is blurred and many systems are developed using an evolutionary approach Ian Sommerville 2000 Software Engineering, 6th edition. Chapter 8 Slide 5 Uses of system prototypes l The principal use is to help customers and developers understand the requirements for the system Requirements elicitation. Users can experiment with a prototype to see how the system supports their work Requirements validation. The prototype can reveal errors and omissions in the requirements l Prototyping can be considered as a risk reduction activity which reduces requirements risks Ian Sommerville 2000 Software Engineering, 6th edition. Chapter 8 Slide 6 Prototyping benefits l Misunderstandings between software users and developers are exposed l Missing services may be detected and confusing services may be identified l A working system is available early in the process l The prototype may serve as a basis for deriving a system specification l The system can support user training and system testing Ian Sommerville 2000 Software Engineering, 6th edition. Chapter 8 Slide 7 Prototyping process Establish prototype objectives Define prototype functionality Develop prototype Evaluate prototype Prototyping plan Outline definition Executable prototype Evaluation report Ian Sommerville 2000 Software Engineering, 6th edition. Chapter 8 Slide 8 Prototyping benefits l Improved system usability l Closer match to the system needed l Improved design quality l Improved maintainability l Reduced overall development effort Ian Sommerville 2000 Software Engineering, 6th edition. Chapter 8 Slide 9 Prototyping in the software process l Evolutionary prototyping An approach to system development where an initial prototype is produced and refined through a number of stages to the final system l Throw-away prototyping A prototype which is usually a practical implementation of the system is produced to help discover requirements problems and then discarded. The system is then developed using some other development process Ian Sommerville 2000...
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This note was uploaded on 11/09/2009 for the course SE 120336 taught by Professor Unknown during the Spring '09 term at Avila University.

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ch8 - Ian Sommerville 2000 Software Engineering, 6th...

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