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ADVANTAGES OF OHP - PowerPoint PPT Presentation


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ADVANTAGES OF OHP. brightness. 2. Direct eye-contact. 3. Ease of use. 4. Abundance of materials. 5. Manipulable. 6. Availability of materials. 7. Self-prepared materials. 8. Advance preparation. 9. Impact on attitudes. Wharton Applied Research Center , 1981.

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Presentation Transcript
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More individuals followed the recommendations of presenters who used OHP than those who did not
  • Presenters who used OHP were perceived as better prepared , more professional , more persuasive , more credible and more interesting
  • Groups that used OHP more likely to reach consensus on their decisions
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Cabeceiras , 1972

10. Organisation & discussion

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Teachers who use the OHP tend to be more organised

  • Students participated more frequently in discussion
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1. Not preprogrammed

  • effectiveness depends on the presenter
  • cannot display visual sequence or audio
2 not self instructional
2. Not self-instructional
  • Designed for large-group presentation
  • Not suitable to independent study
  • Captions & audio tracks would not be self-instructional
3 production process required
3. Production process required
  • Printed materials & nontransparent items cannot be projected immediately
  • Have to transfer into transparencies first
  • Example : magazine illustrations
4 keystone effect
4. Keystone effect
  • Misrepresentation of images is more common than other projection systems
  • Discrepancy in levels causes a distortion referred to as the ‘keystone effect’
  • projector commonly placed at desktop level to facilitate the instructor’s writing on transparencies
  • the screen needs to be placed on a higher level for unobstructed audience sightlines