Question

what makes a group discussion successful
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Answer 1

$\huge\bold\red{ʜᴇʟʟᴏ!!!}$ $\huge\bold\purple{ʏᴏᴜʀ\:ᴀɴsᴡᴇʀ}$

Initiate the group discussion only when you are clear about the topic because speaking without the subject knowledge gives bad impression. Do not interrupt when others are talking. Even if you are not agreeing with other person, don't interrupt. Everybody has their own opinion.

Answer 2

An effective group discussion generally has a number of elements: All members of the group have a chance to speak, expressing their own ideas and feelings freely, and to pursue and finish out their thoughts. All members of the group can hear others' ideas and feelings stated openly.