An Investigation of Accessibility Issues with the
Programs, Labs, and Equipment Utilized in the Interactive Teaching Methods for
use by Disabled Students.
Steven Sahyun
Oregon State University, Corvallis, OR 97331
Abstract:
While many innovative processes,
curricula, and programs are being developed to give students a better
intuitive, conceptual, and practical understanding of physics, the technologies
employed, and reliance on computer techniques may prohibit some disabled
students from taking an active role in the learning process unless some simple
considerations are heeded.
This paper will try to
elucidate some of the areas, equipment, and programs where disabled students
may be at a disadvantage, and to try to suggest some alternative methods to
provide equivalent learning experiences.
The items reviewed in this paper will be primarily concerned with items
portrayed at the Summer Session of Teaching Introductory Physics Using
Interactive Teaching Methods and Computers held at the University of Oregon,
June 21-July 3, 1998.
1. Introduction
Many of the techniques being
developed in course curricula, and with computer based laboratories and
simulations, are an attempt to provide significant learning experiences to a
larger distribution of students than that provided by traditional lecture
methods. [1] In an attempt to
provide the widest range of learning,
it is important to address the issue of teaching to students with
disabilities. This is a necessary
consideration not only due to regulations from the Americans with Disabilities
Act [2], but also from a pedagogical standpoint in that what helps one student
access information, may also be beneficial to many others. In addition, since many of the reforms,
changes in methodologies, and software and hardware developments are in the
introductory stages, there is a unique chance to incorporate necessary changes
with very little difficulty.
Creating programs that are inherently accessible to all students is
easier than trying to retrofit an entrenched system.
This article is not intended
to be a definitive text on adaptive technologies. Rather, it is hoped that the reader may glean some insight
to the issues that are mentioned, even though the author is not particularly
known in either the teaching or disabled access communities. Some thought should be given as to how
instructors, developers, and programmers can modify their procedures, labs, and
code, at the outset, to make their items more flexible and adaptable to all
students. It is the intention of
this article to bring these issues to the table for discussion.
It is quite obvious that
there are many limitations to disabilities, and that there are certain
experiences or procedures that are simply not possible to accomplish with
current methods and technologies.
However, as many of the course programs utilize partners in labs and
problem solving work groups, with care, many of the problems that a disabled
student might encounter can be removed.
The items reviewed for
accessibility issues follow in three general categories: Course Books and
Pedagogies, Computer Methodologies, and Laboratory Equipment. Neither the items reviewed, nor the
treatment given to those items should be considered comprehensive. Rather, what follows is an attempt at a
cursory review, and discussion of accessibility issues relating to, some items
seen during the Summer Session of Teaching Introductory Physics Using
Interactive Teaching Methods and Computers held at the University of Oregon,
June 21-July 3, 1998.
In the review of materials,
particular attention is paid towards visual disabilities as that is an area in
which the author has the most experience.
However, attempt is also made to consider difficulties that individuals
with hearing loss, or limited motion, may experience. Generally, criteria will focus on clarity, ability of text
to be displayed in an electronic format, use of multi-modal (the ability to
interact with more than one sense) presentation, and ease of physical
manipulation of controls.
2. Course Books and
Pedagogy
The reviews and commentary in
this section have been organized by alphabetical order.
Collaborative Problem
Solving: In this method, small
groups of students (usually groups of
3) act as teams; one person acts as manager, one as recorder, and one or
more skeptics. They respond to a
given problem via a white-board upon which the recorder writes the solution
that the group works out. The large
surface of the white-board provides an area for spatial representations. It
also allow for a common communication surface for individuals with
speech/hearing/linguistic difficulties.
The group nature and the flexibility of the environment may produce one
of the most accessible situations.
Graphs and diagrams would still need to be prepared separately, but
group partners could be used for explanations. Any text could be given on a floppy disc for reading by a
computer with a speech synthesizer.
Interactive Lecture
Demonstrations: While these demonstrations are inherently visual, care can be
taken to explicitly state what is happening in the graphs being displayed. Previously taken data can be given to
visually disabled students in the form of tactile or auditory graphs.
RealTime Physics and Workshop
Physics [3]: One of the primary
advantages of these programs is that the text (and that of Workshop Physics)
will be available on CD-ROM from John-Wiley. The files are in an electronic format which is of a great
advantage for disabled students in that they can use computers to either read
or to magnify the text of the book.
These courses usually have fairly simple images which can be converted
to tactile means.
There will be difficulty with
visually disabled students drawing graphs for many of the pre-lab
preparations. However, arrangements
could be made with a tutor to either transcribe the graph or with the
instructor, so that the student could participate. During the lab sections, partners could help with the
transcription, as long as the student is directing what to have written.
A more substantial problem is
that the labs utilize software to graph data. Some ideas on accessibility solutions to the data will be
mentioned later. For the present,
assume that the student has partners who are able to adequately describe and
assist in graphing predictions and results, and in operating any graphical user
interfaces on the computers. The
student would be able to assist in performing the motion for the graphs,
partners providing directions about movement.
Students with hearing loss
should have little difficulty with the lab situation as these labs tend not to
rely solely on auditory cues.
Also, the computer can provide a useful venue for communication as lab
partners can type their ideas on the screen if they are unfamiliar with sign
language.
Students with motion
difficulties should still be able to participate as many of the motion examples
involve carts or masses on springs.
These students can still participate in the experimental set-up through direction
of activities and in the collection of data, via adaptive cursor control items,
or a single key-press. In
addition, motion sensors are sensitive enough to allow for good data from even
limited motions, be it from a cart or from a person¹s motions.
One of the difficulties of
RealTime physics with respect to blind students, is that the pedagogical avenue
of receiving information about the experimental system as the experiment is
progressing is essentially unavailable.
In several studies [4], it has been shown that students who see graphs as the data is being
acquired show significantly better conceptual understanding about the data the
graphs represent than compared to students who were given graphs delayed by as
little as 30 seconds. Thus, to
provide a similar instructional experience, it is not simply enough to give
blind students the data after the fact, whether it is by raised image
production or by sonification (turning a data set into a representation
displayed through sound.) Instead,
real time displays, whether by moveable cursors, or auditory displays are
necessary to provide equivalent access to instruction.
Tutorials in Introductory
Physics: [5] These texts (tutorial and homework) are particularly nice for
visually disabled students as the primary focus is on the conceptual ideas
rather than the visualization. The
images are cleanly drawn and should be fairly easy to adapt to tactile
pictures. The structure of the
course allows for group interaction, thus providing for student partners to
interact as interpreters (and allowing less reliance on a tutor). There is a fair reliance on
visual aspects (figures, ray diagrams) but they are approached in a manner that
allows for easy interpretations as a blind student could use the lab partners
as ³light detectors².
3. Computer Methodologies
As more and more courses and
materials become available on the World Wide Web, access of material to
disabled students is generally greatly improved. Students who have limited motion no longer have to make arduous
treks to libraries, deaf students are able to read text summaries of lectures
and not have to rely on interpreters.
This is valid only as long as sounds and movies are properly annotated. Sounds generally can not stand on their
own as cues or information as not only deaf students, but anyone without proper
sound systems are unable to become informed. Blind students have access to text in electronic format
through the use of voice synthesizers and screen reading programs, however, web
sites heavily laden with pictures, image maps, frames, and many applets, are
outside their reach. Web pages
should be constructed with these limitations in mind.
Often, pages can be easily
adapted for coherent use by blind students. While pictures themselves are not accessible, images
can be properly annotated with comments.
This is easily performed as in the following HTML example for including
a picture:
<img
src=²picture.gif² alt=²text
explanation of picture goes here² >
Web page design programs have
a field for the text entry (usually referred to as an alt tag) so it is not
necessary to edit raw HTML code.
Proper annotation of pictures is not only useful to blind students reading
the pages, but also to anyone who is using a text based browser such as LYNX on
UNIX machines, or for those who do
not automatically download images into their browsers.
Additionally, if a page
includes an image map (a picture containing different links depending on what
is selected) it is best to also include these items as list text links at the
end of the page. In some cases,
especially if there is a liberal use of frames within a page, a separate,
non-frame text page may be desired.
A link to the text page should appear at the top of the page, and in the
first frame.
The problem with many JAVA
application programs seen within a web page (referred to as applets) is due to
the development of the language itself.
Java 1.2, should it ever leave beta testing, will have full support for
control and selection via keyboard
and screen readers in that controlling items will all be accessible and have
labels. However, this does mean
that previously compiled applets may need to be recompiled (or modified) to
take advantage of the newer capabilities.
Currently, only sighted students can access applets. Since many students will typically
access the applets, it may be advantageous to keep as much text and explanation
of what is seen in the applet embedded in the web page and not as commentary
within the applet itself; thus even if the applet doesn¹t work on their system
or they can not see the program, students will have some idea as to the
information contained in the applet.
ActiveX components offer
another access route for programming and inclusion in web pages. However, care must still be used when
designing applications so that controls are labeled and grouped in a coherent
manner.
On-line assignment programs
such as WWWAssign (wwwassign.physics.ncsu.edu) or the Web Assignment System at
Dickinson appear to be quite flexible and should be generally accessible. The only difficulty that non-sighted
students would have is in accessing images given on homework or tests. However, proper labeling and with
braille images should allow general access to these materials. Since the tests are generally given as
text with data entry fields, there is little difficulty for screen readers to
access the text.
In the area of developing
software, even seemingly impossible to adapt software still holds some hope of
conveying information to blind students.
For example, take the Visualizer program by Tufts University Center for
Math and Science Teaching: it¹s highly dependent on sight, there¹s nothing that
can, or should, be changed about that.
But it becomes partially accessible when images of the vectors are
printed out to Flexi-Paper [6] which is a paper that expands when printed
portions are exposed to heat. For
students with movement difficulties, or anyone that has poor mouse control,
this program could be improved by having a larger ³grab² area for the vectors
(better still to have a variable active grab region that the user could
adjust). Currently, one can only
move the vectors if one carefully clicks on the very tip of the vector arrow. One of the very useful features to
color-blind students, is the ability for the user to change colors of the
vectors.
4. Laboratory Equipment
and Data Acquisition Software
The Pasco [7] equipment is
generally very well made. It
appears that they have taken a lot of effort to construct devices that are
clearly labeled with symbols to their function. Also, the data probes, even those with the same general
package design (for example: sound, heart rate, and current sensors), have
enough unique features to allow for identification by their shape alone (the only
exception is that there is virtually no distinction between the light sensor
and the high sensitivity light sensors).
The computer interface boxes are also clearly labeled, and it is quite
easy to tell the position of probe to be attached by feel. If necessary, one could attach braille
labels to the top of the connector box for further identification. While the photo-gate ³picket fence²
fits fairly easily on top of the motion carts, the pattern on these plates
could stand to have a slightly greater tactile distinction between the clear
and opaque segments. The only
other item that could be difficult for students to manipulate is an easily
replaceable thumb screw used to fix the photo-gate to a stand.
The operating software for
the Pasco interface, both in
Windows 3.1 and Windows95 versions, is more difficult to operate however. Some necessary functions for acquiring
data are not available via keyboard controls. Most notably, assigning a data probe to a data port, and
deleting acquired data sets. Other
functions such as acquiring data, opening a table, and exporting data as a text
file are possible via the keyboard.
Keyboard control is particularly necessary for all students if no mouse
is available because all of the com ports on a computer are connected to other
devices.
Similarly, Vernier¹s [8] data
acquisition program, LoggerPro,
also lacks the ability to have keyboard control of assigning a data
probe to a data port. Generally, this
program was slightly easier to navigate and assign characteristics by keyboard
than Pasco¹s program.
The Macintosh versions of
LoggerPro and MacMotion [9] have starting, and stopping, of data acquisition
with a single key-press of the ³return¹ key. Thus, if students are working in a group, any student can
easily participate in the acquisition of data.
One of the important
pedagogical aspects of these data acquisition programs is their ability to
instantly display data.
Unfortunately, there is no direct way for visually disabled individuals
to participate in this learning process.
A simple tone plot, with the y axis represented by pitch, would allow
for some immediate feedback for not only these individuals, but for anyone who
is unable to see the monitor while data acquisition is in process. The sound display aspect of a graphing
program could be easily incorporated in all software so developers do not have
to produce and ship a special edition that educators may be unaware of.
5. Conclusion
A main point to keep in mind
when considering students with disabilities, is to portray information in more
than one context. For example, if important information is only displayed as a
sound, there needs to be consideration for the students who (either by physical
or technical limitations) can not hear that sound.
The wide use of computers in
the classroom, in the laboratories, and in preparation of materials, offers an
exciting chance for disabled students to participate to a greater extent than
ever before. Web based programs,
text, and applications have advantages in that they can be transmitted across
phone lines, thus freeing students who live at a distance or have difficulty
traveling to a single location that may not have equipment that meets their
adaptive needs. Care must be taken
however, to insure that limitations in the ability to display the information,
do not interfere with the ability of students to learn. Examples of this are proper notation of
graphic images, especially in web pages or allowing for control of computer
actions other than by a mouse.
In programming systems, all necessary
functions of the program should have keyboard equivalent actions, which is useful to not only blind
students, but also to those who have difficulty manipulating a mouse (or if the
mouse is unavailable!) Also, if
color coding is important, there should be some method letting students adjust
the color to provide greater contrast.
Advantages of utilizing
electronic text (as opposed to printed text, or text displayed as an image of
the text) is that it easily allows for adjustable text size for reading by
students with low vision, or synthesized reading for students with no vision or
for those have difficulty understanding written text.
One of the major difficulties
with electronic text is formatting and display of mathematical equations. If they are presented in a graphical
manner, then blind students will be unable to read them.
Resources to help in making
text, pictures, and equations accessible can often be found on the Web. For example the Science Access Project
at Oregon State University [10], has developed a number of items to this
effect. The TRIANGLE program that
has been created, is a workspace designed for visually disabled students and
scientists. This program includes
a text editor that allows for complex linear math notation and characters, a
table viewer, a graphing calculator, and a figure viewer. This program is specifically designed
to be friendly to screen readers and braille displays. If spatial display of
equations is desired, DotsPlus, which is perhaps the only method, allows for
unique representation of characters, numbers, and tactile images to create
coherent text and equations.
DotsPlus can then be printed out via a high resolution graphic embosser
called the Tiger printer being developed by the Science Access Project, or onto
Flexi-Paper.
In addition, many
universities have some type Student Disability Service, that can provide other
resources to instructors, or information to community members.
As mentioned in the
introduction, the underlying issues involved in making physics accessible to
all students is a daunting task.
The ideas and items mentioned in this article display but a tiny
fraction of the problems encountered and possible solutions. Many other solutions can be found when
one gives some careful thought as to how students use a product, and what
happens if someone needs to access material in a non-standard manner. It is also important to keep in mind
that not all students will see or hear the material under ideal conditions, and
some redundancy should be included so that no student is left without the
benefit of recent developments in the teaching of physics.
References
[1] Enough research has be
produced in this field to fill volumes.
Examples of this type of research can be found in many articles. Two of which are L. C. McDermott,
³Millikan lecture 1990: What we teach and what is learned — closing the
gap² Am. J. Phys. 59, 301-315
(1991) and R. K. Thronton & D. R. Sokoloff ³Assessing student learning of
Newton¹s laws: The Force and Motion Conceptual Evaluation and the Evaluation of
Active Learning Laboratory and Lecture Curricula² Am. J. Phys. 66, 338-352 (1998).
[2] Information about the ADA
can be obtained from http://www.usdoj.gov/crt/ada/adahom1.htm. The ADA covers effective communication
with people with disabilities, and requires reasonable modifications of policies
and practices that may be discriminatory.
[3] RealTime Physics, Active Learning Laboratories. Sokoloff, Thornton, and Laws. John
Wiley, NY. 1999; Workshop Physics Activity Guide, Priscilla Laws, John Wiley,
1997
[4] M. C. Linn et al.
³Cognitive Consequences of Microcomputer-Based Laboratories: Graphing Skills
Development.² Contemporary Educational Psycohology 12, 244-253 (1987)
[5] Tutorials in Introductory
Physics. McDermott et al. Prentice Hall. 1998.
[6] Flexi-Paper is produced
by Repro-Tronics Inc. More information can be found at:
http://www.repro-tronics.com/
[7] Pasco Scientific, 10101
Foothills Boulevard, Roseville, CA 95678. http://www.pasco.com/
[8] Vernier Software, 2920
S.W. 89th St., Portland, OR 97725
[9] MacMotion is produced by
Tufts University, Center for Science and Mathematics Teaching , Medford, MA
[10] Information about the
Science Access Project, including programs and current research projects can be
found on the web at http://dots.physics.orst.edu. Some items of interest include TRIANGLE, MathPlus Toolbox,
the Tiger printer, and DotsPlus.
[11] Windows 3.1 and Windows
95 are trademarks of Microsoft Corp.; Macintosh is a trademark of Apple Computer.