  We present two conceptually new modeling approaches aimed at describing the
motion of pedestrians in obscured corridors:
  * a Becker-D\"{o}ring-type dynamics
  * a probabilistic cellular automaton model.
  In both models the group formation is affected by a threshold. The
pedestrians are supposed to have very limited knowledge about their current
position and their neighborhood; they can form groups up to a certain size and
they can leave them. Their main goal is to find the exit of the corridor.
Although being of mathematically different character, the discussion of both
models shows that it seems to be a disadvantage for the individual to adhere to
larger groups. We illustrate this effect numerically by solving both model
systems. Finally we list some of our main open questions and conjectures.
