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the data relates back to major scientific principle with which
you begin.
 The conclusion should be firm and decisive.
 The conclusion of the presentation is its most important
moment. It provides the take-home message, often the only
thing that will be remembered. It determines the final
impression and impact that you will make on your audience.
The conclusion should always be reduced to a concise
statement, preferably shown as text or a simple diagram on the
overhead.
 The conclusion should consist of a simple major statement,
with not more than two or three connotations, if these are
absolutely essential.
 The conclusion should very clearly demarcate the end of the
lecture.
 The most important rule for a scientific presentation is to finish
on time and on a clear and resonant note.

ANSWERING QUESTIONS.

 The speaker should attempt to control the crowd, permitting
question as the speaker's convenience.
 By making it politely clear that the audience should not
interrupt, the speaker will discourage impulsive ad hoc
questions and can focus on the presentations. In doing so, you
will also establish control and authority. [jww. This is tricky
than it seems since an inexperienced speaker may have omitted
an essential piece of information the audience need to
understand the talk. A clarifying question promptly answered
may save such a situation.]
 Always answer questions briefly and to the point.
 It is in many cases advantageous to repeat the question before
answering it. In addition, repeating the question gives you the
chance to rephrase the question.
 It is always a good idea to be polite and gracious.

The most important advice to remember is,
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