  Understanding movement in heterogeneous groups is important for a meaningful
evaluation of evacuation prediction and for a proper design of buildings. The
understanding of interactions and influencing factors in heterogeneous groups
on key performance figures is fundamental for a safe design. This contribution
presents results of experimental studies on movement of a crowd through a
bottleneck involving participants with and without disabilities. High precise
trajectories of the attendees extracted from video recordings were used to
calculate density and velocity of the participants. Besides the
well-established fundamental diagram new insights into the individual relation
between density and velocity are discussed. A complex structure and considerate
behaviour in movement implicates a strong influence of the heterogeneity on key
performance values of safe movement.
