An observation in Psychology that suggests that the number of mental objects the average person can keep track of is seven (plus or minus two).
A sample of the target audience for which a product or service is intended.
The degree of difference between the two sides of an object or system.
A field of study that aims to understand the user experience of a product or service. Conducting UX research includes interviewing, observing, and surveying users. Understanding the user experience is important because it helps designers understand how to design a better product that will be more appealing and usable for people.
A key performance indicator is a variable that measures how well an entity is performing. It's a figure that designates an individual or item's performance level. A particular company may use metrics such as sales, revenue, production, and market share to gauge the success of their firm.
The distance between two points of extrusion or an object. It can also be defined as the measurement of size.
The art and discipline of putting together set of typefaces into a harmonious and readable type system. A typeface designer spends much time considering many things such as clear visual message, readability at different sizes, legibility at small point sizes, ease of use for printing processes on its own or over the top of other fonts.
A selector that can be applied to any HTML element. ID should be used when designing for a single instance, such as using the id="main" attribute on an <h1> tag.
A usability assessment method that is used to evaluate a design against established usability principles or heuristics. It is based on the idea that designers can use their experience to find areas of poor design without extensive user testing.
All available space (line-height) between two consecutive lines of text; this measurement should be adjusted for either ascenders or descenders. In hand typesetting, leading referred to thin strips of lead inserted by hand between lines of type in the composing stick to increase vertical distance.
A pixel, or a picture element, is the smallest addressable element in a display device.