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Investigation Report Electronic Typeface Readability

electronics

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Investigation Report
Electronic Typeface Readability

Introduction

Readability is a major importance and concern to those who create any type of media that contains text.  The use of the Internet has increased dramatically and therefore the readability issues of electronic text affects many people on a daily basis.   Readability of electronic text displays is therefore an important factor to consider when presenting any type of electronic information.   The importance of readability on an electronic monitor mirrors the importance of that in print.  Electronic media also gives the designer and viewer many other advantages such as an added ease of use and accessibility to media.  Text can be presented dynamically and simultaneously with other types of media like sound and graphics.  Electronic media also affords inexpensive customizability, allows interactivity and connectivity to others.   This new technological era has opened up the way for profusion of media and the best type of presentation for users should be determined.  Muter (1996) suggests that reading speed of electronic text is 28% slower than of print.  He recommends that several variables factor into the readability of text on a monitor.  These factors include image resolution, screen size, color, anti-aliasing, interline spacing, distance to the screen and font size and character spacing.  Designers do not have control over many of these factors since image resolution, screen size and distance to the screen will change with each user and device.  The rules that apply to paper media do not necessarily pertain to that which is viewed electronically.   For example, newspapers are printed in serif fonts, such as Times or Courier.  “Common wisdom developed over centuries is that serifs, the little horizontal lines at the tops and bottoms of characters, make text easier to read.” (Wilson, 2001)  Serif fonts are the print of choice in nearly all books, magazines and newspapers.  The resolution for print media is 180 dpi (dots per inch) and higher whereas the resolution of a computer screen is much less, about 72 dpi.   Print media also displays text with at least a single stroke width separating each character.  The eye is capable of recognizing this separation and comprehending each character easily.  Text displayed electronically may eliminate this visual segregation of one letter from another due to inadequate spatial resolution making characters invade one another’s space (Lee, 1996).   Sans serif fonts, which are fonts that do not contain the extra short lines, are argued to be a superior choice for electronic media due to the lack of extra lines. (Tullis, Boynton, and Hersh, 1995).   Cook (2001) presents an online guide to optimizing readability for the web.  He proposes using short paragraphs, no longer than five sentences long with only 8 to 15 words per line with maximum contrast between the background and text. 

            There is abundant information on the Internet that contains recommendations about font type and backgrounds as well as commentaries.  Unfortunately, there is little evidence other than personal preference to back these recommendations.  A few studies and experiments have been done researching digital readability.  Chung, Kolatch, Sculimbrene, and Wen (2000) studied the readability of digital media based on different screen sizes, using Personal Data Assistant's (PDA's) and laptops. They showed that reading speed is not affected by screen size and the screen size of a device does not affect the error rate in reading.   As the use of small portable computing devices becomes widespread in society, the readability of text on these devices becomes an increasing concern.  Text with poor readability may cause slow processing and the reader to leave the display.  While most displays have text presented on plain backgrounds, an increasing number use textured backgrounds are found, especially on the Internet.  Scharff, Ahamuda, and Hill (1999) have conducted several experiments looking at text width, contrast, and background texture. These authors have shown that single line spacing is read at a significantly slower pace than 1.5 inch spacing or double spacing.  They also prove that size 14 font is significantly faster to read than size 12 or 10 font.  Significance was found between size 10 and size 14 fonts at single and 1.5 line spacing.  They recommend using at least a font size of 12 with 1.5 or double line spacing for the best readability.  Tullis, Boynton, and Hersh, (1995) conducted an experiment examining different sizes of fonts in the Windows environment.  They found that a decline in display reading performance could be as high as 40 percent when compared to the same text read from paper. These authors proved that MS Sans Serif and Arial fonts are preferred at font size 8.25 to 9.75.  Although all of these studies were administered in an experimental situation where the variables were controlled, only Tullis, Boynton, and Hersh studied the readability of font types.  This was limited to arial, sans serif and serif in sizes 6.0 to 9.75.  Hoffman’s (2001) online survey that asked for reader’s preferences when shown text excerpts in Arial, Helvetica, Times New Roman, Verdana, and Trebuchet MS fonts.  Results from the survey have shown a significant preference to the sans serif fonts, specifically Verdana as having the best readability.  While Hoffman and Wilson (?) have examined the area of text readability subjectively, the font typeface chosen may not necessarily be the easiest to read since subjective preferences do not necessarily match the true objective data. In order to determine an empirical recommendation for the best typeface, an experiment was conducted testing reaction time versus font typeface in an objective situation. 

Methodology

Participants

         41 Participants, ages 18 to 53, were selected from the Educational Technology Department. All participated by accessing the online based instrument through a website.  27 were observed in the Educational Technology Laboratory and used Macintosh G4 computers.  There is no information on the type of system the other participants used. 

Instrument

The instrument design used by Scharff et al. (2000) was replicated since the design had been proven successful in measuring objective data for testing readability. The multimedia-based instrument was created using Macromedia’s Dreamweaver, Fireworks and Director. Dreamweaver was used for the web page design and Director used to introduce the interactive elements needed to create the objective parameters.  The text was taken from Microsoft Word and formatted graphically with Fireworks (figure 1).  Data was collected using a FileMaker Pro database.  

Figure 1 Screenshot of online test


Experiment

The experiment consisted of 6 types of font with 6 excerpts of text from Alice and Wonderland by Lewis Carroll. Text was chosen because of its entertainment value and consistent reading level.  Each font was matched with each text excerpt, allowing for 36 screens. Excerpts consisted of 103 (+/- 2) words at an 8.5 grade reading level. 3 sentences were added prior to the 103 +/- text excerpt and 3 sentences following to mimic an actual page of text. A word corresponding to a symbol (circle, square, and triangle) was randomly hidden in the 36 samples of text based on the 6 sections it was divided into. Corresponding symbols were placed below the text excerpt.  Black text was presented on a white background and the black symbols were presented on color  #CCCC99.  The experiment is designed to be completely self-explanatory and self-administered as shown in figure 2 and the practice as seen in figure 3 and 4.

Participants were directed to the beginning screen with instructions. The participant read the directions and completed three practice exercises where they were asked to locate the symbol word in the middle paragraph then click on the corresponding symbol. Each experimental section began with a start button on a blank screen (#CCCC99) to facilitate the collection of reaction time.  The clock started when the start button was clicked and data was collected when the participant clicked the mouse on the symbol. The database recorded the test, screen number and time.  Average time to administer the test was approximately 15 minutes with directions and personal data collection.


Figure 2 the instructions


Figure 3 Practices


Figure 4 Practices

Data Analysis

Test results were collected and analyzed using Excel and Statview. Results were analyzed using repeated factorial ANOVA statistics comparing the six different fonts. A significance level of 0.05 was set.  Data showed that Typeface made a significance difference (F=4.470; DF=5,40; p=.0007) in Readability.  Means for the typeface were Times (9.537), Helvetica (10.626), Trebuchet (10.793), Verdana (11.760), Arial (9.387) and Georgia (10.812).  Fisher’s PSLD showed that the sans-serif font, Times proved to be the most readable showing statistically significant values when compared to Trebuchet (p=.0367), Verdana (p=.0003) and Georgia (p = .0339).  There was no significance shown between Arial and Times.  Arial proved to be significantly easier to read than Helvetica (p=. 0391), Trebuchet (p=. 0195), Verdana (p<. 0001) and Georgia (p=. 0079)..  Ficher’s PSLD was run to compare Gender and Readability of Typeface.  Gender proved to be a significant factor in determining readability with p = .0200. Males took significantly longer to find the symbol word than females. 

Discussion

Based on our results we recommend that Times or Arial be used as the typeface for display on computer screens.  Although subjective research has shown that the sans-serif font, Verdana is the font of choice, this study has shown that Times and Arial are actually easier to read since the reaction times were faster than the other 4 fonts.  The results are not significant enough to recommend Times or Arial as being a better font than the other.   This experiment needs to be run with more participants before an empirical statement can be made proving that one font is better to read online than another.  All participants were not observed and the data collected from those who were unobserved may have variables which would affect the results such as outside stimuli or system difficulty.  Since gender proved to be significant when compared to the typeface and readability, the authors suggest that further study be done to determine if there is a difference in the type of  typeface objectively preferred by gender. 

References

Chung, I., Kolatch, E., Sculimbrene, S., Wen, H. The Effect of Screen Size on Readability Using Three Different Portable Devices. 2000. Online Research Experiments. SHORE. Available: http://www.otal.umd.edu/SHORE2000/portadevs/. October 8 2001.

Hoffman, Bob. Text Readability. October 22, 2001. Online survey. Available: http://edtechfm.sdsu.edu/bhoffman/type/. October 9 2001.

Lee, A. Reading Electronic Text. Los Gatos: Beta Research Inc, 1996.

Merriam - Webster Online. 2001. Online reference. Collegiate Dictionary. Available: http://www.m-w.com/tools/search/searchboxes.htm. November 26, 2001.

Muter, P. 'Interface Design and Optimization of Reading of Continuous Text.' Cognitive Aspects of Electronic Text Processing. 1996. Ed. H. Van Oostendorp, and de Mul, S. Norwood: Ablex Publishing Corp., 1996.

Scharff, L., Hill, A. 'Readability of Computer Displays as a Function of Color, Saturation, and Background Texture.' Engineering Psychology and Cognitive Ergonomics, Vol. 4 (2000): 123-30.

Scharff, L., Williams, S. The Effects of Font Size and Line Spacing on Readability of Computer Displays. 1999. Available: http://hubel.sfasu.edu/research/SWExp.html. October 10 2001.

Tullis, T., Boynton, L. and Hersh, H. (1995).  Readability of Fonts in the Windows Environment [Interactive Poster].  CHI '95 Proceedings. Retrieved October 10, 2001, from the World Wide Web: http://www.acm.org/sigs/sigchi/chi95/Electronic/documnts/intpost/tst_bdy.htm

Wilson, R. (2001, March 1, 2001). HTML E-Mail:  Text Font Readability Study [online magazine]. Web Marketing Today. Retrieved October 12, 2001, from the World Wide Web: http://www.wilsonweb.com/wmt6/html-email-fonts.htm

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