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PRACTICAL AND GOOD PRACTICE ISSUES
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As the market for Internet-delivered computer-based testing develops, and as the technological sophistication of the products increases, so the issue of ensuring that those who use such tests and assessment tools follow good practice will increase in importance
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TESTING ON THE INTERNET
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In this section we will consider a range of inter-related issues:  Performance characteristics and technical limitations of the Internet as a test delivery medium: speed, network integrity, reliability, bandwidth etc  Security: protecting the publishers IPR; controlling test access and distribution, keeping scoring and rules con dential  Privacy: controlling access to test results, legal issues relating to data protection, privacy and storage  Fairness: equality of access for all groups to the net closing the digital divide
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It is in the area of performance that the major current limitations of the Internet are to be found Testing makes two main requirements of the delivery medium First, it should provide the means of controlling the timing of delivery Second, it should be robust and not fail mid-way through a test Rapid delivery of pages to the user cannot be relied upon at present for a number of reasons Many users are still on the end of a slow modem connection While publishers can ensure that their servers deliver pages faster than users can call for them, slow connections at the user end, or other delays caused by the Intranet itself, can result in the actual appearance of pages on the user s browser appearing to be very slow Even if the user has a broadband connection and there are no delays on the Internet, the most rapid delivery is only of value if it can be relied upon Hang-ups and lost Internet connections can potentially terminate a test session in mid-stream For some tests it is not practical simply to resume from the point at which a break occurred For example, at present it is not safe to rely on the integrity of the Internet to the extent we would require for timed testing, even if we could be sure the page ow rate could be fast enough The easiest way to overcome these performance issues is to download any time critical material as an applet This at least will ensure that the test administration is not dependent on the Internet for its timing and integrity However, from the user s point of view this may create another problem: if the connection is a slow one or the applet is large, the applet may take a considerable time to download Furthermore, many organizations will not allow applets through their corporate re-walls Consistency of Appearance The Internet poses some of the same problems as stand-alone computer-based testing For example, the test distributor has no direct control over the user s screen size or resolution For standalone systems software controls can be used to mitigate and control some of the extremes of variation in screen settings For
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COMPUTER-BASED TESTING AND THE INTERNET
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browser-based testing, however, the level of control is rather less Browsers are designed to leave the user in control of navigation around the Web and to be able to examine and modify the page display parameters in ways that we would wish to prevent in a normal test-taking situation Furthermore, there is no one standard browser Currently, two browsers dominate the market: Internet Explorer and Netscape Navigator Unfortunately, these do not display information in exactly the same way As a result, a test will look different and may behave differently depending upon the browser you are using This problem is exacerbated by the fact that each of the browsers exist in a range of versions which also differ in how they render information Again, the solution to these problems, where they are likely to compromise the integrity of a test, is to create the test within an applet that can be downloaded and run on the user s computer
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