  Recent advancements in mobile devices encourage researchers to utilize them
in collaborative environments as a medium to interact with large shared
wall-displays. In this paper, we focus on a semi-controlled user study that we
conducted to measure the collaborative coupling ratio between partners working
in pairs in a collaborative setup equipped with a shared tiled-wall display and
multiple mobile devices. We invited 36 participants in 18 pairs to take part in
our experiment in order to analyze how they communicate and collaborate with
each other during the experiment. We observed their collaborative coupling by
measuring how often they verbally and visually communicated. Further, we found
frequently used collaborative physical position patterns by observing the
pairs' physical arrangements and standing positions. Moreover, we combined
these factors to gain a clearer understanding of coupling in our setup, taking
into account the mobility factor offered by the mobile devices. Results of the
study show interesting findings about the coupling factors between the partners
mainly due to the flexibility offered by including mobile devices in our
collaborative setup.
