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1 8 Chapter 1 Whpt is interaction design?

(c) A well-designed authoring too1 should let the user create a basic page in about 20 min-
utes. Learning the full range of operations and possibilities is likely to take much
longer, possibly a few days. In reality, there are some good authoring tools that allow
the user to get started straight away, providing templates that they can adapt. Most
users will extend their repertoire, taking another hour or so to learn more functions.
However, very few people actually learn to use the full range of functions provided by
the authoring tool. Users will tend to remember frequently used operations (e.g., cut
and paste, inserting images), especially if they are consistent with the way they are car-
ried out in other software applications. However, less frequently used operations may
need to be relearned (e.g., formatting tables).

The usability goals discussed so far are well suited to the design of business systems
intended to support working practices. In particular, they are highly relevant for
companies and organizations who are introducing or updating applications running
on desktop and networked systems-that are intended to increase productivity by
improving and enhancing how work gets done. As well as couching them in terms
of specific questions, usability goals are turned into usability criteria. These are
specific objectives that enable the usability of a product to be assessed in terms of
how it can improve (or not) a user's performance. Examples of commonly used us-
ability criteria are time to complete a task (efficiency), time to learn a task (learn-
ability), and the number of errors made when carrying out a given task over time
(memorability).

1.5.2 User experience goals
The realization that new technologies are offering increasing opportunities for sup-
porting people in their everyday lives has led researchers and practitioners to con-
sider further goals. The emergence of technologies (e.g., virtual reality, the web,
mobile computing) in a diversity of application areas (e.g., entertainment, educa-
tion, home, public areas) has brought about a much wider set of concerns. As well
as focusing primarily on improving efficiency and productivity at work, interaction
design is increasingly concerning itself with creating systems that are:

satisfying
enjoyable
fun
entertaining
helpful
motivating
aesthetically pleasing
supportive of creativity
rewarding
emotionally fulfilling