Planning effective HCI to enhance access to educational applications

Information and communications technologies (ICT) are widely believed to offer new options for Web-mediated courseware design. Multimedia and online courseware development accentuates a belief that highly graphical (or visual) delivery media will meet the individualised instructional requirements of diverse student cohorts. While most electronic courseware may allow the user to proceed at their own pace, two assumptions are commonly made by courseware designers. Firstly, to facilitate learning, all users are assumed capable of assimilating the graphical content with their current experiential knowledge. There is little or no consideration of different cognitive styles. Understanding learner attributes is essential to increasing accessibility to computerised information. Secondly, learning is assumed rather than demonstrated. To deal with this issue, data analysis techniques can be used to differentiate between what an individual knows from what they do not. This paper presents two research projects that demonstrate the importance of awareness for the human-dimension of human-computer interaction (HCI) in designing effective online experiential learning for special education

O efeito “dominó” na Interacção Homem-Computador

A colaboração multidisciplinar é essencial para uma interacção homem-computador (IHC) efectiva. Historicamente a ciência dos computadores, a psicologia e as ciências sociais actuavam como disciplinas independentes, mas com o aumento da frequência na utilização das tecnologias da informação e comunicação em vários aspectos do dia-a-dia, a funcionalidade e acessibilidade assumiram uma importância cada vez maior. Neste artigo é apresentada uma reflexão sobre a multidisciplinaridade e transversalidade da IHC em termos tecnológicos e tendências futuras

O efeito "dominó" na interacção homem- computador

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The effects of web-mediated instructional strategies and cognitive preferences in the acquisition of introductory programming concepts: a Rasch model approach

This is a quasi-experimental study that aims to examine the interactive effects of web-mediated instructional strategies and learners’ cognitive preferences in their acquisition of introductory programming concepts. The thesis knowledge domain is an introduction to computer programming knowledge, designed for non-computer science students. It is the intention of this study to extend the McKay (2000a) research to examine the interactive effects of web-mediated instructional strategies and cognitive preferences in the acquisition of introductory programming concepts in Malaysian universities. Whereas the instructional strategies investigated by McKay (2000a) were paper-based, they involved graphical metaphors. Instead, this thesis interrogates whether or not information communications technology (ICT) elements such as signals (or cues), interactive animation, navigational tools, words and graphics influence students’ cognitive performance, and whether there are interactive effects of their cognitive preferences that contribute to the results. This study recognises the complex nature of the web-mediated learning environment and the difficulties experienced by students due to their lack of prior programming knowledge, which were first analysed by Bagley (1990) and revised by McKay (2000a). This empirical study examined the performance of novice-learners (or -programmers) with different cognitive preferences using two web-mediated instructional strategies: 1) text-plus-textual format and 2) text-plus-graphical format. The participants were primarily second year undergraduate students, in Malaysia, who are required to enrol in an Introductory Programming course as part of their program requirement for the first time. They were classified for the purpose of this research as novice-learners. The subsequent data collected included scores from three instruments: 1) pre-test; 2) post-test and 3) cognitive styles analysis. The validity and reliability of the cognitive performance measurements (pre- and post-test) were confirmed according to Rasch model using the Quest interactive test analysis system software (Adam & Khoo, 1996). These cognitive performance measurements were found to have strong validity with the item fit statistics produced by the Quest estimate and ranged from 0.81 to 1.22, strongly upholding that the test-items sampled the one construct. Further analyses were conducted, based on effect size (Cohen’s d) to compare the magnitude of difference between groups (Cohen, 1977). The results suggest that there is no clear evidence that a cognitive preference plays an important role in cognitive performance when learning from web-mediated instructional modules. However, it has been observed that the analytic-verbalisers performed better when the instructional format they received suit their cognitive preferences with a medium effect size. As the participants were novice-learners, the influence of prior domain knowledge cannot be ignored. The findings of this doctoral study contribute new knowledge to the existing literature in the related disciplines of human–computer interaction, web-mediated instruction, human cognitive processing and research methodology. Firstly, the use of high-quality measurement tools to assess the effectiveness of web-mediated instructional strategies is important. Secondly, the findings can provide guidelines on how to design web-mediated instruction for high-element interactivity knowledge domains such as the acquisition of programming concepts. Finally, the learner’s cognitive learning preference profile should be considered when designing web-mediated instruction and in particular their level of prior domain knowledge