CRT스크린 형태 변인-라인 간격, 강조기법, 단락표제위치, 난외표제(running head)가 일렉트로닉 텍스트의 레지빌리티(legibility)에 미치는 영향 = Effects of CRT Screen Format Variables-Leading, Highlighting Techniques, Heading Location and Running Head-on the Legibility of Electronic Text
저자
김영수 (사범대학 교육공학과)
발행기관
학술지명
권호사항
발행연도
1989
작성언어
Korean
KDC
051
자료형태
학술저널
수록면
65-92(28쪽)
제공처
소장기관
The purpose of the present study was to examine the effects of four screen format variables on the legibility of computer screen based electronic text. An experimental study was conducted to accomplish the purpose of the present study.
Subjects included 96 college students, 45 male and 51 female students from Ewha Womans University and Yeonsei University, Seoul, Korea. Subjects were volunteers and were randomly assigned one of the 24 experiment conditions.
The stimulus materials used for the experiment included 24 computer screen based texts developed by using the four screen design format variables; Leading(single, double), Highlighting Techniques(flashing, inverse video, no highlighting), Heading Location(embedded heading, isolated heading), Running Head(running head used, no running head). These are the electronic text design variables which became the independent variables for the experiment.
Therefore, experimental design of this study was 2x3x2x2 ANOVA and consequently 24 CRT electronic text models were produced. The 24 texts were developed by using excerpts from high school English textbooks.
These computer screen based electronic text models were designed on an IBM AT compatible personal computer with a GW Basic and Korean word processor Gem 2. The text models were displayed on a 12 inches monochrome CRT screen.
A questionnaire was then introduced to evaluate subjects views on the 24 CRT electronic texts and the four screen design formats. The questionnaire composed of an attitude scale and a preference form.
The attitude scale composed of 8 items and each item had a 5-point scale. Therefore, the total score of the attitude survey ranged from 8 to 40.
A pilot study was conducted prior to main experiment. In the experiment subjects were given a general introduction about the experiment and steps to follow through the experiment. Then each subject received the introductory unit and main unit on a computer screen. In the introductory unit, subjects were shown a sample text model on the CRT screen and explanations of four design variables. Then they were shown 6 to 12 text of electronic texts and to provide a reference for their evaluation of the target text.
Following the introductory unit, the target text model was displayed on the screen and subjects were asked to take the questionnaire. The experiment was competed within 10 minutes.
The following are the results of the experiment: From the ANOVA results, three significant main effects and one two-way interaction effect were deduced. On Leading variable, the double spacing condition was preferred to the single spacing condition. On Ghighlighting Techniques, inverse video and no highlighting conditions were preferred to the flashing condition, respectively. On Heading Location, the isolated heading condition was preferred to the embedded heading condition.
A significant interaction between the Leading and Heading Location variables was attributable to the poor performance on the attitude scale under the single spacing condition compared to the other three conditions. This interaction can result when a heading is separated from the main text, whether line spacing is single or double does not matter, but when a heading is included in the main text, line spacing makes a difference in legibility of the electronic text. Therefore, under the embedded heading condition, double spacing should be used for displaying the electronic text.
The subjects preferences on the four CRT screen design variables were computed. The following interesting results were found: On Leading, 70 percent single spacing text while, 30 percent of the subjects preferred single spacing text.
In terms of Highlighting Techniques, 82 percent of the subjects favored inverse technique and only 15 percent favored flashing technique. It seems that when subjects were given an English text, they tried to read and make sense out of it. Therefore, flashing of certain words was found to be a source of distraction for them.
On Heading Location and Running Head conditions, subjects preferred isolated heading and running head texts, respectively.
To conclude, subjects preferred electronic texts with double spaces, inverse highlighting, headings separated from the main text with a running head located on the top right hand corner of the screen.
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