groups: one that had access to the PSA and the other did not (used direct
manipulation). At this stage the PSA did not include the personality features,
discussed hereafter; the intention was to demonstrate the potential of the
technology. The criteria used for the evaluation was based on user attitudes
towards the system, expectations versus experiences of the system, ease of use,
reliability and appropriateness of assistance, presentation performance and
efficiency. The evaluation was recorded through careful observation of the users
and questionnaires. The following table shows the initial results obtained. All
rating are measured on a scale of 1-5 with 5 being most positive.
The following table provides the average results of the systems usability
efficiency performance measurements. To evaluate performance here, the time
to complete a task was measured from the time the user pressed the first button
until the final results screen was displayed. The results indicate that the average
performance was higher using the PSA.
Easy to use||
(4.9) Very Important||
(4.0) Somewhat easy|
Easy to learn||
(4.9) Very Important||
(4.5) Very easy|
(4.4) Somewhat important||
(3.9) Somewhat fast|
(4.3) Somewhat important||
(4.2) Somewhat helpful|
(3.4) Somewhat important||
(4.6) Very pleasant|
(4.6) Very important||
(4.3) Somewhat efficient|
(2.8) Not very important||
(2.7) Not at all amusing|
(4.9) Very important||
(4.3) Somewhat reliable|
(5.0) Very important||
(3-7) Somewhat confident|
|Comparison of User's Expectation and Experiences with KIMSAC|
From the results of this usability evaluation it is clear that the PSA contributes
significantly towards the ease of use of the system. This is evidenced by the
nature of the problems encountered by users who did not have access to the PSA
information. Generally, user attitudes towards the system were positive. Those
users who had access to the PSA assisted interface rated the system more
positively than those users that did not. The results further show that %80 of the
users resorted to the PSA assistance to complete their individual tasks.
With Access to PSA||
Without Access to PSA|
3 Extended Asset DescriptionsThe development of a standard Asset Description Language assisted in
application coordination, shared content structure for many of the
communications between agents and eased the integration between multimedia
and agent software. The Asset Description Language offers:
|• ||a structured way of co-ordinating multimedia content and domain data for
agents without agents having to understand the raw content (multimedia);|
Questia, a part of Gale, Cengage Learning. www.questia.com
Book title: Human-Computer Interaction:Communication, Cooperation, and Application Design.
Contributors: Hans-Jörg Bullinger - Editor, Jürgen Ziegler - Editor.
Publisher: Lawrence Erlbaum Associates.
Place of publication: Mahwah, NJ.
Publication year: 1999.
Page number: 148.
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