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ADVANTAGES OF OHP

ADVANTAGES OF OHP

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ADVANTAGES OF OHP

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  1. ADVANTAGES OF OHP

  2. brightness

  3. 2. Direct eye-contact

  4. 3. Ease of use

  5. 4. Abundance of materials

  6. 5. Manipulable

  7. 6. Availability of materials

  8. 7. Self-prepared materials

  9. 8. Advance preparation

  10. 9. Impact on attitudes

  11. Wharton Applied Research Center , 1981

  12. 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

  13. Cabeceiras , 1972 10. Organisation & discussion

  14. Teachers who use the OHP tend to be more organised • Students participated more frequently in discussion

  15. LIMITATIONS

  16. 1. Not preprogrammed • effectiveness depends on the presenter • cannot display visual sequence or audio

  17. 2. Not self-instructional • Designed for large-group presentation • Not suitable to independent study • Captions & audio tracks would not be self-instructional

  18. 3. Production process required • Printed materials & nontransparent items cannot be projected immediately • Have to transfer into transparencies first • Example : magazine illustrations

  19. 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