lecture10_2up - Object-Oriented Software Engineering...

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Object-Oriented Software Engineering Practical Software Development using UML and Java Chapter 7: Focusing on Users and Their Tasks Lecture 10 520 7.1 User Centered Design Software development should focus on the needs of users • Understand your users • Design software based on an understanding of the users’ tasks • Ensure users are involved in decision making processes • Design the user interface following guidelines for good usability • Have users work with and give their feedback about prototypes, on-line help and draft user manuals
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521 The importance of focusing on users • Reduced training and support costs • Reduced time to learn the system • Greater efFciency of use • Reduced costs by only developing features that are needed • Reduced costs associated with changing the system later • Better prioritizing of work for iterative development • Greater attractiveness of the system, so users will be more willing to buy and use it 522 7.2 Characteristics of Users Software engineers must develop an understanding of the users • Goals for using the system • Potential patterns of use • Demographics • Knowledge of the domain and of computers • Physical ability • Psychological traits and emotional feelings
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523 7.3 Basics of User Interface Design • User interface design should be done in conjunction with other software engineering activities. • Do use case analysis to help deFne the tasks that the UI must help the user perform. • Do iterative UI prototyping to address the use cases. • Results of prototyping will enable you to Fnalize the requirements. 524 Usability vs. Utility Does the system provide the raw capabilities to allow the user to achieve their goal? • This is utility . Does the system allow the user to learn and to use the raw capabilities easily ? • This is usability . Both utility and usability are essential • They must be measured in the context of particular types of users.
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525 Aspects of usability Usability can be divided into separate aspects: • Learnability —The speed with which a new user can become profcient with the system. • EFfciency oF use —How Fast an expert user can do their work. • Error handling
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This note was uploaded on 02/23/2012 for the course CS 307 taught by Professor Staff during the Summer '08 term at Purdue University.

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lecture10_2up - Object-Oriented Software Engineering...

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