  In this article we review our work on the production of hadrons in the
nuclear environment. We work with a string-breaking model for the initial
production of hadrons and with a quantum-kinetic transport model (GiBUU) to
describe the final state interactions of the newly formed (pre)hadrons. The
latter are determined both by the formation times and by the time-development
of the hadron-hadron cross section. We first show that only a linear
time-dependence is able to describe the available hadronization data. We then
compare with detailed data from HERMES and JLAB; very good agreement is reached
in all reactions studied without any tuning of parameters. We also repeat
predictions of spectra for pions and kaons at JLAB@12GeV. We finally explain
the absence of CT effects in the recent experiment on proton transparencies in
quasielastic (QE) events on nuclei. We propose to look instead for CT effects
on protons in semi-inclusive DIS (SIDIS) events.
