Presenting the large
stationary image
Presenting the large stationary image
Start calmly
Allow students to absorb the projected image before giving explanations:
wait 15 to 20 seconds (the time needed to activate the subject-related parts of the brain; the long-term memory resides all over the brain)
Point with a pencil to key points on the transparency, not to the screen.
Thus you remain facing your audience and can monitor its reactions.
Provide information step by step
Show only that part of the transparency which is relevant at that point
 
in time. This arouses student curiosity and leaves you clearly in command.
Then cover the part already discussed and proceed by uncovering what
 
follows. This creates a calm learning environment. Then present the overview with the final impact by revealing the ENTIRE transparency.
 
By the way, covering a part or parts of the transparency stimulates both teacher and student, but do not overdo it. Trying to show only a very small part of a transparency can be counter-productive. It is more effective to show the entire transparency and use a pointer to highlight the area where students should focus. A black bar on the screen can also be used to direct students' attention to the point where they should begin interpretation to get a logical build up of understanding.
Questioning is the key
An appropriate picture always enriches an explanation, even when you
  are not directly referring to it.
 
The transparency acts as an eye catcher, creates a positive atmosphere and aids retention.
Don't be tempted to give away the story too soon.
  Questioning is ALWAYS the best method because the overhead projector is first and foremost a medium for discovery learning.
   
Ask a question, provide a few seconds "wait time" and invite a student
to respond.
Let a student come forward to point out and explain an aspect of the
  projected image.
Let students unravel clues in the image.
Let students individually or in small groups design their own questions
 
and answers. Let them take notes. Apply their questions when designing
later tests.
The question method stimulates and activates the mind. Moreover, it prevents you from talking too much and from students listening too much.
 
The question method requires that the teacher is aware that asking questions about a projected transparency is a lot more productive than telling stories to it. Use the 20 second wait-time which students need to gain a first impression of the image, to formulate an effective question rather than to prepare your story


Questioning is the key

Excessive exposure is
damaging
-
keep the surprise effect.
Show 3 to a maximum of 10 transparencies perlesson and
ensure that you reveal
them at the critical moment