This great usablility checklist comes from Paper Prototyping: The Fast and Easy Way to Design and Refine User Interfaces (Interactive Technologies) by Carolyn Snyder. Published in 2003, and pertaining to many types of interfaces, I am starting to use it for all of my web projects.

One other question I’ve been asking a lot lately is “Why would anyone want to use this?”

Somewhat surprisingly, many people on many projects don’t have a quick answer.

Usability Checklist

Concepts & Terminology

• Do users understand the terms used in the interface?
• Are there concepts they gloss over or misconstrue?
• For new concepts, is the user able to figure them out?

Navigation, Work Flow & Task Flow

• Are users able to find their way around?
• Will they search, use links, or both?
• If there’s a work flow or sequence of steps, does it match what users expect?
• Do they have to keep flipping back and forth between screens?
• Does the interface ask for inputs that the users don’t have, or don’t want to enter?

Content

• Does the site/interface provide the right information for users to make decisions? What things do they look for?
• Is it useful and/or interesting to them?
• Is ther extra content that they don’t need or that annoys them?

Documentation, Help

• What assistance does the user need to successfully complete tasks?
• What’s the best way to provide that information?
• Can users quickly find the information they need, and make sense of it?

Requirements & Functionality

• Does the interface do the right set of things for its target audience?
• Do users have additional needs that aren’t being satisfied?
• Is there anything you could do to make the user’s life easier?
• Are you planning to implement something that users don’t really need?

Screen Layout

• Is the amount of information per screen overwhelming, not enough, or about right?
• Do users miss seeing something that’s important?
• Are there elements that need to be brought out more in the visual design? Any that distract the user?
• Has white space been used effectively? Images?
• Do we have the right stuff “above the fold?”

Brand

• Does the interface reflect the qualities that the company wants to convey?
• Does the user experience match what the designer intended?
• Are there frustrations or obstacles that can be removed?
• Do users like it?

Colors, Fonts and Other Graphic Elements

• Can users see/read everything well enough?
• Do the most important elements stand out?
• Are there any considerations pertaining to lighting vision difficulties, or color blindness?
• Is the interface aesthetically pleasing?
• Do users understand what the icons mean?

Widgets & Controls

• Do the rollover menus work for users or do they have trouble?
• Do users notice the status line message?
• Can they figure out what the cursor changes mean?
• Will multiple windows be a problem?
• Do the slider controls have the right granularity?
• Did we pick the best keyboard shortcuts?

Response Time & Performance Metrics

• Does the system respond quickly enough to satisfy users?
• Do the pages load fast enough?
• Does the display change quickly enough when the user manipulates a control?
• Are there any download or processing delays that users might find annoying or unacceptable?
• How quickly can users complete this task?

Real-world Use

• How does this tool fit with others that users have?
• What things will annoy power users after 6 months?
• Which of these function are people really going to use?
• What happens when the user is interrupted mid task?

Paper Prototyping also has good techniques to shorten development times and sell ideas to Internet non-experts. Buy it here at Amazon.