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I found an interesting question about how to contribute to meetings confidently My answer was:
First You have to know the meeting agenda and attendees
Second You have to collect data and information about the attendees if you do not know them or the subject that will be discussed in the meeting.
Third You have also to be formally well-dressed . This gives you self confidence and reflect your image.
Do not forget to take necessary documents you may need in a meeting …
Self confidence is highly required in all activity we do, not just meetings.