Of the 750 event organisers, delegates, graduate and undergraduate students interviewed, almost all said that face-to-face meetings were most effective with a group size no larger than ten.
The research, which was conducted in conjunction with The Right Solution and measured the value of face-to-face communication, showed that 85% of respondents thought engagement was most effective among smaller groups.
Emma Boynton, head of sales and marketing for imago, said: "With only 3.4% of delegates expressing a preference for large meetings, it is clear that organisers need to ensure that breakout and group interaction sessions are given as much, if not more attention than plenaries in the planning of large events."
The research also examined the venue research and booking process, with 85% of organisers saying a venue should be equipped with latest technology before booking.
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