CH14 - Systems Analysis and Design in a Changing World,...

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14 Systems Analysis and Design in a Changing World, Fourth Edition
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14 Systems Analysis and Design in a Changing World, 5th Edition 2 Learning Objectives Describe the difference between user interfaces and system interfaces Explain why the user interface is the system to the users Discuss the importance of the three principles of user-centered design Describe the historical development of the field of human-computer interaction (HCI) h
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14 Systems Analysis and Design in a Changing World, 5th Edition 3 Learning Objectives (continued) L Describe the three metaphors of human-computer interaction Discuss how visibility and affordance affect usability Apply the eight golden rules of dialog design when designing the user interface Define the overall system structure as a menu hierarchy
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14 Systems Analysis and Design in a Changing World, 5th Edition 4 Learning Objectives (continued) L Write user-computer interaction scenarios as dialogs Create storyboards to show the sequence of forms used in a dialog Design windows forms and browser forms that are used to implement a dialog List the key principles used in Web design
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14 Systems Analysis and Design in a Changing World, 5th Edition 5 Overview User interfaces handle input and output that involve a user directly Focus on interaction between user and computer called human-computer interaction (HCI) c Metaphors to describe the user interface Usability and Web-based development guidelines Approaches to documenting dialog designs, including UML diagrams from OO approach
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14 Systems Analysis and Design in a Changing World, 5th Edition 6 Identifying and Classifying Inputs and Outputs Identified by analyst when defining system scope Requirements model produced during analysis Event table includes trigger to each external event Triggers represent inputs Outputs are shown as responses to events
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14 Systems Analysis and Design in a Changing World, 5th Edition 7 Traditional and OO Approaches to Inputs and Outputs Traditional approach to inputs and outputs Shown as data flows on context diagram, data flow diagram (DFD) fragments, and detailed DFDs OO approach to inputs and outputs Defined by message entering or leaving system Documented in system sequence diagram (SSD) D Actors provide inputs for many use cases Use cases provide outputs to actors
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14 Systems Analysis and Design in a Changing World, 5th Edition 8 User versus System Interface System interfaces – I/O requiring minimal human interaction User interfaces I/O requiring human interaction User interface is everything end user comes into contact with while using the system To the user, the interface is the system Analyst designs system interfaces separate from user interfaces Requires different expertise and technology
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CH14 - Systems Analysis and Design in a Changing World,...

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