The technology acceptance model also points out the importance of
whether users find a system useful and are thus motivated to use it. Since this is
an important HCI concern, we can measure whether the information technology
is found to be useful by examining whether the system provides support for
an organizational member’s individual tasks.We can also measure whether there
are important tasks that a user of the new system could not perform prior to its
implementation. Our measurements can also determine whether the system
extends a user’s capabilities (for example, increasing the ability to perform
higher-level analysis quickly or performing an on-the-spot translation of a financial
report into another language complete with currency conversions). Part of
the usefulness criterion in HCI can also be measured by ascertaining whether
users find it rewarding to use the system through postimplementation interviews
and observations.