Time. Don't exceed your allotted time; generally keep presentation to 80% of the allotted time. [In the course, can use full time..]
Content. Can you summarize it in few well-constructed sentences?
That you can say without reading them?
Structure. A well-prepared abstract,
an organized set of well-chosen viewgraphs,
For long talk, a concise `cheat-sheet,' and
an outline to keep you on track during talk.
For short talk, know everything you wnat to say.
(That is why you practice repeatively.)
Know your stuff. Accurate, well-phrased scientific descriptions portray speaker as a knowledgeable, reliable source of information.
Rehearse. Always rehearse a presentation. For each talk, prepare from scratch, always with the specific audience in mind.
Formulation and Argumentation. Talk proceeds as a logical unfolding of information; each step firmly based on the previous one.
To communicate effectively, avoid jargon. Speech reflects thought processes; often an imprecise speaker is an unfocused thinker.
Delivery. As in writing, the end of the sentence is the stress position; Here audience expects most important or new information.
Slowing down is a remedy for most speakers' problems.
Stand near visual material and point to it specifically and not to laptop.
Looking straight at members of the audience establishes that you are
not just in front of them, but talking to them.