A screen-based control used to select one item from a list of mutually-exclusive items (i.e., use radio buttons when only one item in a list of several items can be selected).
Rapid Prototyping
Quickly generating mockups of what a system will look like to facilitate internal review or testing.
Rating Scales
A range of numbers in a sequential order that respondents use to assign a value to a given subject.
Readability
The degree to which users can easily and accurately read information on a web page
Reading grade level (RGL)
The level of education a user would need to understand a piece of content
Representative sampling
Choosing a group of participants that represent your target audience
Responsive Design
A web design approach aimed at crafting sites to provide an optimal viewing experience across platforms and devices.
Return on investment (ROI)
The value of the investment of time or resources relative to the expense of the effort.
Reveals
Information that automatically appears on the screen during a Web-based slideshow presentation, or while viewing a multimedia Web page.
Rollovers
A state change that involves one element being replaced by another upon the mouse going over it.