Lecture 17 - Designing interfaces and dialogues. In this chapter we talked about: Explained the process of interface and dialogue design, contrasted and apply methods for interacting with a system, listed and described various input devices and factors affecting their usability. | Business System Development CSC581 Lecture 17 Designing Interfaces and Dialogues 2 Summary of the previous lecture In previous lecture, we : Explained the process of form and report design. Applied general guidelines for formatting forms and reports. Used color and know when color improves the usability of information. Formatted text, tables, and lists effectively. Outlines We today’s lecture we will: Explain how to assess usability and describe factors affecting usability. Explain the process of interface and dialogue design. Contrast and apply methods for interacting with a system. List and describe various input devices and factors affecting their usability. Describe guidelines for designing interface layout, data entry field structure, feedback, and system help. Design graphical user interfaces. Assessing Usability Overall evaluation of how a system performs in supporting a particular user for a particular task There are three characteristics Speed Accuracy Satisfaction 6 . | Business System Development CSC581 Lecture 17 Designing Interfaces and Dialogues 2 Summary of the previous lecture In previous lecture, we : Explained the process of form and report design. Applied general guidelines for formatting forms and reports. Used color and know when color improves the usability of information. Formatted text, tables, and lists effectively. Outlines We today’s lecture we will: Explain how to assess usability and describe factors affecting usability. Explain the process of interface and dialogue design. Contrast and apply methods for interacting with a system. List and describe various input devices and factors affecting their usability. Describe guidelines for designing interface layout, data entry field structure, feedback, and system help. Design graphical user interfaces. Assessing Usability Overall evaluation of how a system performs in supporting a particular user for a particular task There are three characteristics Speed Accuracy Satisfaction 6 Guidelines for Maximizing Usability Consistency: of terminology, formatting, titles, navigation, response time Efficiency: minimize required user actions Ease: self-explanatory outputs and labels Format: appropriate display of data and symbols Flexibility: maximize user options for data input according to preference Characteristics for Consideration User: experience, skills, motivation, education, personality Task: time pressure, cost of errors, work durations System: platform Environment: social and physical issues Methods for Assessing Usability Time to learn Speed of performance Rate of errors Retention over time Subjective satisfaction Errors in Web Page Layout Design Non-standard widgets Appearance of advertising Bleeding edge technology Scrolling text and looping animations Outdated information Slow download times Fixed formatted text Long pages Good Web Design Practices Lightweight Graphics: small images to quick image download Forms and Data Integrity Template-based HTML Templates .
