Abstract

Mischief is a system for classroom interaction that allows
multiple children to use individual mice and cursors to
interact with a single large display [20]. While the system
can support large groups of children, it is unclear how
children’s performance is affected as group size increases.
We explore this question via a study involving two tasks,
with children working in group sizes ranging from 1 to 32.
The first required reciprocal selection of two on-screen
targets, resembling a “swarm” pointing scenario that might
be used in educational applications. The second, a more
temporally and spatially distributed pointing task, had
children entering different words by selecting characters on
an on-screen keyboard. Results indicate that performance is
significantly affected by group size only when targets are
small. Further, group size had a smaller effect when
pointing was spatially and temporally distributed than when
everyone was concurrently aiming at the same targets.