Human-Computer Interaction: Communication, Cooperation, and Application Design

By Hans-Jörg Bullinger; Jürgen Ziegler | Go to book overview
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.
Characteristic Pre-test Expectations Post-Test Experiences
Easy to use (4.9) Very Important (4.0) Somewhat easy
Easy to learn (4.9) Very Important (4.5) Very easy
Fast (4.4) Somewhat important (3.9) Somewhat fast
Helpful (4.3) Somewhat important (4.2) Somewhat helpful
Pleasant (3.4) Somewhat important (4.6) Very pleasant
Efficient (4.6) Very important (4.3) Somewhat efficient
Amusing (2.8) Not very important (2.7) Not at all amusing
Reliable (4.9) Very important (4.3) Somewhat reliable
Confidential (5.0) Very important (3-7) Somewhat confident
Comparison of User's Expectation and Experiences with KIMSAC
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.
With Access to PSA Without Access to PSA
Average time Range Average time Range
2.6 min 1-10 mins 3.0 mins 2-10 mins
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.
3 Extended Asset Descriptions
The 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);

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