The interpretation of the poem by the group has to be uniform in order to convey the message of the poem.
 
Physical Grouping:
The group artistically, but avoid spreading the group too far apart.
Vary the levels of the speakers e.g. some standing on chairs, some sitting on chairs, standing on floor level, sitting on the floor and even using ladders or rostra (platforms).
Sizes of groups within the group may be variy
Voice Grouping:
The group should appear to speak together, feel together and think together.
Most of the poem is usually spoken by the entire group.
Certain lines and sections may be interpreted by various voices according to tone - girls/boys, high/low.
Occasionally a individual voice may be used.