for presentation

good

index

achieve purposes - sell/pursuade

use non-verbal expressions - acting/intonation

consider characteristic of audiences

humor

clear pronunciation

using visual/auditory materials

should be connected smoothly

good timing to change

role distribution

research / making ppt / making experiment

teamwork - it shouldn't be looked like a solo presentation

each presenter has consistent opinion

each part should be related each other - pointing at certain conclusion

someone has to be a leader... ㅠㅠ

someone should arrange the situation

leader's role make others boost (communicate / give opinions)

(using ppt) too many words

speaking too fast / slowly

too many gestures

less confidence

stutter

just reader (no eye contact, no communication ...)

opposite ...