Summary System Analysis and Design Chapter 8

Chapter 8

User Experience
 User Interface – inputs and outputs that directly involve a human user/actor
 A dialog goes on between actor and system
 User interface design must focus on entire User Experience (Human Computer Interaction –HCI)
 User Experience - aspects of user interaction with application, including actions, responses,
perceptions, and feelings
 Called User - Centered Design
 Design techniques that make the user interface feel like the whole system
 Focus early on users and their work
 Evaluate designs to ensure usability
 Use iterative development
 Usability is the objective - How easy a system is to learn and use
 Human-computer interaction (HCI) - studies the efficiency and effectiveness of user interfaces,
focusing on human-cantered technology and user psychology


Components of the User Interface




Metaphors of Human Computer Interaction
 Metaphor
 analogies between features of the user interface and aspects of physical reality with which users
are familiar
 Direct manipulation metaphor
 A metaphor where on-screen objects resemble physical items (pictures) or symbols (icons)
 Desktop metaphor
 A metaphor where the display has a central workspace surrounded by tool icons along the edges
 Document metaphor
 Metaphor in which data is visually represented as paper pages or forms
 Dialog metaphor

,  Metaphor where user and computer work together through a conversation or dialogue using text,
voice, or buttons




Direct Manipulation, Desktop, and Document Metaphors on one screen




Dialog Metaphor