ACM Computing Surveys 31(4), December 1999, http://www.acm.org/surveys/Formatting.html. Copyright © 1999 by the Association for Computing Machinery, Inc. See the permissions statement below.

Quantitative Evidence For Differences Between Learners Making Use Of Passive Hypermedia Learning Environments

Megan Quentin-Baxter
University of Newcastle
Faculty of Medicine ComputingCentre
Newcastle upon Tyne
United Kingdom, NE2 4HH.
Tel: (0191) 2225017
Fax: (0191) 2225016
Email: megan.quentin-baxter@ncl.ac.uk


Abstract: This paper presents a summary of the results of several relatively large studies which attempted statistical analysis of audit trails created by learners accessing information in typical hypermedia or hypertext learning environments, and interpreted them in relation to learner characteristics and study tasks. Significant differences in the information access strategy, amount of information accessed, student estimates of achievement and knowledge outcome were observed between learners in these studies. This paper concluded that some learners may be systematically disadvantaged where support for (or the delivery of) the curriculum depends on hypermedia, such as via a networked learning environment delivered passively over the WWW. It is suggested that the audit tools available from the WWW provide an opportunity to develop multi-discipline evaluation mechanisms which may enable researchers to provide learners with standard "learning profiles" with which to reflect on their own learning effectiveness when using hypermedia educational materials.

General Terms: Hypermedia, Evaluation

Keywords: Hypermedia, Hypertext, Evaluation, Quantitative, Learning Style


1 INTRODUCTION

Several studies investigating the use of hypermedia and hypertext educational learning materials (courseware) have attempted to quantify the effectiveness of learners accessing information in a hypermedia learning environment, in relation to moderator variables such as learner characteristics or learning task. The philosophy of an unstructured hypermedia of units of information connected by many associative links presents a large, passive environment [Nelson 1988], [Nielsen 1990a] in which the context for accessing information is established by the learner (discovery learning), in relation to an overall purpose or task [Malone 1981], [Markle 1992]. Hutchings, et al. [Hutchings 1992], (p 172) told us that "Learners differ, not only in terms of abilities, strategies and styles, but in their goals and contexts" and that "learners'" goals and actions are likely to be shaped by the changing display of information" before them. Hypermedia that adapts to the learner or their goal requires either pre-programmed knowledge about the learner, or extensive classification of the information and its suitability, in order to enable it to "intelligently" respond to the actions of a learner [Hekmatpour 1995]. This empowers the tutor by increasing the likelihood that the learner will visit valuable learning materials, and reduces the individualisation of the learning experience for each student by partially overriding the personal goals and the context generated by their prior knowledge and experience.

Evaluating the effectiveness of learning via passive hypermedia may be more difficult than for more traditional educational courseware [Kulik 1998], [Clark 1985], [Kulik 1991], particularly as it has been shown that in passive hypermedia students do not cover the same subject information [Quentin-Baxter 1997]. The quantity and the content of the information accessed from courseware is a component of the evidence for learning when considering learning outcomes. Although it often not possible to determine the level of student engagement with the accessed material, information which is not accessed has no opportunity to be learned.

Continuous tracking using audit trails or video protocols have been widely applied to gathering behavioural data from hypermedia learners, but there are relatively few examples in the literature of attempts to interpret the data beyond "looking" at it (e.g. [Perlman 1989], [Mayes 1988]). Logging or tracking learner interactions and then analysing the audit trails by calculating the amount of time spent in (e.g. [Loo 1990]), estimating the relative proportion of time spent doing (common to behavioural studies [Atkins 1989]), or counting the frequency of accesses to [Hammond 1989], [Edwards 1989] are examples of measuring what information students have accessed and how they have studied, and provides a basis for identifying "outliers" to the main group. The analysis of standardised audit trails using graphical and statistical techniques provides a fine-grained picture of student use of a hypermedia learning resource, and can be used to inform the causes of cognitive outcome as a result of using the courseware. Most importantly, it may empower the learner to personalise the learning experience and access the relevant materials by providing a basis for formative, reflective learning processes. This paper summarises some of the literature relating to quantitative evaluation of hypermedia courseware, and discusses how the application and statistical analysis of audit trails, knowledge change tests, learner characteristic tests and questionnaires can help educators to understand and adjust for the differences between learners using hypermedia.

2 QUANTITATIVE EVALUATION OF HYPERMEDIA

There is some indication that learners fail to appreciate the extent of information when it is presented in a hypermedia format, and that learner characteristics may be correlated with the amount of information accessed. Hammond and Allinson [Hammond 1989] used performance logs to count the number of times different types of navigation tool were chosen when hypertext was either alone or combined with one or more other navigation techniques (such as a map, index or guided tour) in two different access conditions: exploratory (knowledge tested after hypertext use) and directed (solving questions during hypertext use). They also compared the number of different screens accessed out of a total of 39 for the four navigation options, the total number of screens seen (including repetitions), and the ratio of new to old screens seen (in each of the two conditions). They found that students in the hypertext-only navigation condition demonstrated significantly less exposure to new information overall than students using hypertext with other navigation techniques (F[4, 70] =3.87 p<0.05 for total screens and F[4,70]=7.03 p<0.001 for different screens). These students' estimates of what they had achieved also diverged significantly more than the other groups (F[4,35]=3.02 p<0.05) in the direction of overestimating. However, these students equalled the other group's learning outcomes in the post-test. The authors quote Baddeley's [Baddeley 1976] total time hypothesis, that the amount of learning is directly proportional to the total time spent in learning, regardless of how the time is distributed, as a possible explanation of this observation.

Quentin-Baxter [Quentin-Baxter 1997], [Quentin-Baxter 1998] also observed that students in her study (n=35) had a poor appreciation of the amount of information that they had covered in a hypermedia learning condition when students were instructed to browse the information available. Audit trails were quantified by categorising and counting the units of information accessed out of a total of 780 units [Quentin-Baxter 1992]. No correlation was found between student estimates of their own achievement when accessing information versus their actual achievement measured from the audit trails (r=0.07 p=0.64), despite the availability of comprehensive maps. A Bland-Altman investigation of this indicated that learners who accessed very little of the information were significantly less accurate when estimating their own achievement than those who accessed more (r=0.78 p<0.001). Quentin-Baxter suggested that learners who over-estimated might prematurely experience a sense of "closure" or completion. Learners were generally inefficient and each accessed very little of the information (<32%), although, altogether, they accessed over 80% of the material available. Learners began by browsing but switched, over time, to interacting with randomly-generated questions which was more task orientated. There was some evidence that students revisited information and used the same strategy when they returned to the program a second time, despite plenty of unaccessed information remaining.

Verheij, et al. [Verheij 1996] considered the use of hypermedia and the composition of audit trails as a possible method for more objectively estimating an individual's preferred learning style than applying one or more questionnaire-based inventories. To investigate this theory (and others) they classified 33 students (out of 142) as either "deep" processors or "surface" processors (according to a questionnaire-based Inventory of Learning Styles developed by Vermunt and Van Rijswijk [Vermunt 1987]), and logged each learner's interactions with a hypertext environment while they completed two tasks: a search task followed by exam-preparation. Each audit trail was categorised into either "Map", "Text Relations", "Linear" or "Mixed", according to the type of navigation technique which students preferred. They observed evidence of a difference between two groups of learners for the search task (c 2(3)=9.13p<0.05), but not for the exam-preparation. Surface processors were consistent in the type of strategy they used for both tasks, but deep processors varied their approach depending on the task, indicating that they were more "versatile" [Pask 1976]. The authors did not state the average quantity of information accessed in the different conditions, but concluded that surface processors might "profit from supporting instruction as to how to define and realize study goals" (p 14).

Yildiz and Atkins [Yildiz 1993] and Yildiz [Yildiz 1994] reported an investigation of the within-medium independent variables "gender" and "prior academic achievement in science" (low, medium and high) when learning from a selection of interactive video teaching programs, using a pre- and post-test multivariate experimental design. In this, prior academic achievement was the only independent variable observed to contribute to explaining the variance in post-test over pre-test scores. Low-ability students did not demonstrate a knowledge improvement as a result of using a hypermedia simulation (n=14 p=0.60), while high-ability students improved significantly between the two tests (n=28 p=0.001). The authors suggested that low-ability students were less able to combine new information from the simulation with previously acquired knowledge, and that:

"The differential effectiveness of the learning experience in terms of pupils' prior achievement was particularly interesting in view of claims of multimedia technologists to make learning more concrete, relevant and understandable - claims which would, if true, assist the less able as much as, or more than, the abler student." [Yildiz 1993] (p 139).

3 DISCUSSION

The findings of these studies suggest that some learners may be failing to thrive in passive hypermedia learning environments, and indicate that independent learner characteristics may influence their ability to access and combine information [Entwistle 1981]. It was not possible to relate the studies in order to determine whether, for example, students who overestimated their progress came from a particular category of learning style or prior academic achievement, because no independent variables were common to all of the studies, and the audit trails were collected and analysed in different ways. Each study was highly specific and, even though their sample sizes were large compared with other studies in this area, it is difficult to generalise their findings for similar learning topics, let alone between subject disciplines.

One tentative conclusion is that some students may be systematically disadvantaged by an increasing dependence on passive hypermedia networked learning environments delivered over the world wide web (WWW), unless developments in adaptive hypermedia are able to cater for these students by varying the controlling effect of the environment [Tergan 1997]. The classification of the information in adaptive hypermedia may require significantly more effort on the part of tutors who may have to rank the value of every piece of information. Fortunately the WWW also provides educationalists with an alternative and the first real opportunity for large-scale evaluation of learners use of hypermedia courseware [Chinien 1994]. It is possible to standardise the collection of audit trails using the WWW through server usage logs, indexing and logging databases, and this data can be dynamically analysed and presented to the learner in the form of charts and simple statistics. Combining the audit trails with information about independent learner characteristics, academic achievement and self-perceived progress has the potential to provide learners with dynamic, personalised "learning profiles" on which to base reflective learning practices. This may act as a hybrid between learner and tutor control by empowering students to identify their progress for themselves and make decisions about future learning needs. Further research is required to inform the development of "learning profiles", especially in order to increase their accuracy across academic disciplines and for different learning conditions, and possibly to identify their role in the development of lifelong learning skills. This may enable learners to adjust their interactive strategies in order to increase their effectiveness when using hypermedia.

ACKNOWLEDGMENT

The author would like to thank Dr G. R. Hammond (Faculty of Medicine Computing Centre, University of Newcastle) for comments on this draft, and the four reviewers for their constructive comments.

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NOTES

This document is a shortened version of a position paper Quentin-Baxter, M. "Evaluating learners in a biological hypermedia learning environment: the use of audit trails and questionnaires for estimating effectiveness and efficiency", prepared for HTF IV workshop held during the WWW7 Conference, Brisbane, Australia, 1997.

Biography

Megan Quentin-Baxter is the Assistant Director of the Faculty of Medicine Computing Centre at the University of Newcastle. She holds a BSc in Zoology and a PhD in Educational Technology. Her research interests are in the use of technology in learning and teaching, in particular the use of networked learning environments to provide a framework for student support and distance learning.


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