Chapter 2 - Design Principles and Usability Goals PDF

Chapter 2 – Design Principles and Usability Goals Design Principles: guidelines for thinking about different aspects of design, helping decide which to include or exclude in an interface. 1) Visibility: controls and functions must be obvious (Easy to see and understand). 2) Feedback: sending i...

Chapter 2 – Design Principles and Usability Goals Design Principles: guidelines for thinking about different aspects of design, helping decide which to include or exclude in an interface. 1) Visibility: controls and functions must be obvious (Easy to see and understand). 2) Feedback: sending information back to user about what has been done. 3) Affordance: attribute of an object that allows people to know how to use it. 4) Constraints: restricts certain actions to prevent user errors. 5) Consistency: keeping tasks and elements uniform across the interface. 1. Internal: maintain consistency within the system layout. 2. External: align design with similar interfaces, user knows what to expect. 3. Aesthetic: keep the look and feel uniform across the interface. 4. Functional: ensures similar actions work the same way across the interface. Design Definition Example Principle Clear and the user can understand what it is Clear buttons: login, logout Visibility used for (control uses). Telling users what’s going on and what must be Sounds, highlighting, animations, Feedback done next. loading sign. Giving hints pop-up messages to tell users Affordance what this button can do. Limitations that restrict users actions, it Date picker only allows picking Constraints deactivates certain actions to avoid errors. future dates. Consistency The layout looks the same throughout the Consistent header and navigation Internal pages. bar on all pages Similar international and national standards / Using a floppy disk icon for the External practices. "Save" function The design is original and has a good Same color, font, characters. Aesthetic appearance. Similar functions to the common controls / Standard "Submit" button style Functional buttons. and placement. Useability Goals: focus on making product easy and effective to use. 1) Effectiveness: The product does what it’s supposed to do. 2) Efficiency: The product does the job quickly and with minimal resources. 3) Safety: The product is safe to use and prevents users from making harmful mistakes. 4) Utility: The product has the right functions for users to achieve their goals. 5) Learnability: The product is easy to learn, even without help. 6) Memorability: The product is easy to remember how to use, even after a long time. User-Experience Goals: focus on how the product makes the user feel. Desirable aspects Undesirable aspects: Satisfying Helpful Fun Boring Unpleasant Enjoyable Motivating Provocative Frustrating Patronizing Engaging Challenging Surprising Making one feel guilty Making one feel stupid Pleasurable Enhancing sociability Rewarding Annoying Cutesy Exciting Supporting creativity Emotionally fulfilling Childish Gimmicky Entertaining Cognitively stimulating Experiencing flow