  Most of the data from the meson factories were available only after the $\pi
N$ partial wave analysis of Koch and Pietarinen was published over 20 years
ago. Since then, both the experimental precision and the theoretical framework
have evolved a lot as well as the computing technology. Both the new and the
earlier data are to be analysed by a highly modernised version of the earlier
approach. Especially the propagation of the measurement errors in the analysis
will be considered in detail, visualisation tools will be developed using the
Python/Tkinter combination, and the huge data base of experiments will be
handled by MySQL.
