Within the context of engineering and technology, the
Institute of Electrical and Electronics Engineers (2009)
articulated the definition of usability in a slightly different
fashion, as the effortlessness with which a person can learn
to use the system. Nielson (2003) refers to usability of
computer systems and web design, identifying usability
as an aspect of quality measuring whether user interfaces
are easy to use or not. Usability can also be applied to
strategies for improving user-friendliness.