This document provides guidance on using an overhead projector for educational purposes. It discusses the history of the overhead projector and how it can be used in classroom instruction. The document outlines advantages like portability and maintaining eye contact with students, as well as disadvantages like needing a power source. Guidelines are provided for effective use, including principles of designing clear transparencies with large text. Display techniques like progressive disclosure and using overlays are also described.

1. Universidad Autónoma de Chiriquí
Faculty of Humanities
School of English
Materials Development-Eng 420
Transparencies (OHP)
Professor: Marisol Barraza
Done by: Gantes & Montero
May 18th, 2016
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2. Introduction
Overhead Projector was created by Jules
Duboscq, in 1870s.
Used during the Second World War
Used as a teaching tool since 1950s.
Become popular easy to used
 Provides an interactive environment for
educators.
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3. Table of Contents
Definitions
Parts of the OHP
How the OHP can be used in different
instructional situations
Advantages of using OHP
Disadvantages of using OHP
Guideliness for use OHP
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4. Table of Contents
Standards in using OHP
Designing OHP transparencies-basic
principles
Producing computer generated OHP materials
Display techniques
Tips for Effective use of OHP
Materials
Conclusion
Reference page
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5. Definitions
Overhead Projector: machine designed to project an
image, text, and drawings onto a small
screen or whiteboard
Transparencies: pages transparent and
flexible used to place information and images
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6. Parts of the OHP
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7. How the OHP can be used in
different Instructional Situation
 Expository teaching of
virtually any type
 Group learning situations
 Enabling members of a group
to display material that they
themselves have produced
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8. How the OHP can be used in
different Instructional Situation
To present activity plan or objectives
 To show tables
To systematize the information to be conveyed
 To list brain-storming ideas
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9. Advantages of using OHP
It is portable
Get transparency materials in low cost
Located in front of the room
Used in a room with normal lighting
It is simple to operate
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10. Advantages of using OHP
 Used as a chalkboard or market board
 Modify transparencies during the presentation
 You can write without turning your back
 Maintain eye contact
 Audiences can follow handout or take notes
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11. Disadvantages of using OHP
 It requires a power supply
 Needs suitable surface about four square feet
 Need spare bulb in case unexpected events
 Many users do not give sufficient thought
to the production of their display material
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12. Disadvantages of using OHP
 Tendency to include too much information in
a single frame
 Teachers or lectures overuse the OHP
 Difficult to transport because of its weigh
 Cost of materials required to operate them
 Used with small audiences.
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13. Guideliness-How to use the OHP
Located it in a place where everybody
can see the screen.
Arrange the projector and screen in a
way to minimize it. It should have
appropriate angles in horizontal and
vertical planes.
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14. Guideliness-How to use the OHP
 Adjust the distance from projector to screen
so the image fills the full area
 Make sure the acetate and open head
surface are clear and free of dust or dirty
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15. Standards in using OHP
 Make the text, illustrations or pictures in
your transparencies big enough
 Schematize: present essential points, one
transparency every 2 or 3 minutes
 Use a pointer to emphasize points on the
acetate
 Plan for a dramatic presentation
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16. Standards in using OHP
 Check visibility; do not block the screen
 Plan your narration.
 Turn on the lamp only if there is
a transparency on the projector
 Put off the projector for prolonged explanations,
or when it is not needed
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17. Designing OHP transparencies-
basic principles
There two basic Principles:
1. Do not try to put too much
information on a single
transparency.
2. Use a clear, systematic layout.
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18. Producing computer generated
OHP materials
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 Use computer to design and produce OHT
 Create both alphanumeric and graphic
materials and print them out in OHP
transparency form - in full color, and with
whatever size of lettering is wanted

19. Display Techniques
a) Progressive Disclosure
Involves covering up all or part of
the material on a given transparency,
and progressively revealing the material
as the presentation proceeds
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20. Display techniques
b) Framing Transparencies
Essential information placed visible for
your audience and notes written for the
teacher’s support
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21. Display Techniques
c) Use of overlays
Whole area of transparency is revealed
from the start, with additional information
being added to the original display by
superimposing further transparencies on
the original.
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22. Display Techniques
c) Use of Overlays
1. To lay separate transparencies
2. Make use of hinged overlays
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23. Tips to use OHP Effectively
1.Just write key points on transparencies
2.Keep transparencies simple - 7X7 Rule
3.Use 18 point type- no more than two type styles
4.Mix upper and lower-case letters for easy readability
5.Do not use exclamation marks, they look like number one.
6.See your overheads from all angles
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24. Tips to use OHP Effectively
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7. Do not turn off all room lights
8. Turn projector lamp off during discussions
9. Never stand anything between the projection and screen
10.Give people time to read
11.Talk to your listeners not the screen
12. Before moving wait for period time to cool
Down - bulb may explode.

25. Materials
a)Transparencies
b)Markers
c)Ruler
d)Cleaning supplies
e)Bulbs
f) A pointer
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26. Conclusion
OHP is a useful tool to project
information for a small audience.
It provides some advantages using
it as well as some disadvantages.
There are some usage principles
teachers should follow to make its
use effective.
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27. References
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Aceret, R. (n.d.). The Overhead Projector: Advantages and Standards.
Educational Technology. Retrieved from http://ed-
tech124.blogspot.com/2013/08/the-overhead-projector-ohp.html
Corey, W. (1999).Overhead projector usage. Business and professional
toastmasters, club #1169. Retrieved from
http://regainthemagic.com/BPToastmasters/overhead.html

28. References
Ellington, H. (1987). A Guide to the use of the overhead projector. Teaching and
learning higher education. Retrieved from
http://files.eric.ed.gov/fulltext/ED289497.pdf
Mott, E. (1983). How to make transparencies for the overhead projector. Azcentral.
Retrieved from http://yourbusiness.azcentral.com/make-transparencies-overhead-
projector-1185.html
Sinan, C. (1991). Using overhead projector in the classroom: Advantages and
disadvantages. Csinan Blog. Retrieveed from
https://csinan.wordpress.com/2013/04/11/47/
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