  We investigate hadron formation in high energy electroproduction off complex
nuclei in the framework of a BUU transport model. Our approach combines a
quantum mechanical treatment of the photon's initial state interactions with a
semi-classical coupled channel simulation of the (pre)hadronic final-state
interactions (FSI). This allows us to study the hadron attenuation observed at
HERMES and to get information on the space-time picture of hadron formation
separately for $\pi^{\pm}$, $\pi^0$, $K^\pm$, $p$ and $\bar{p}$.
