All were examined in detail, measured, photographed, and in some cases given different dates from those in the 1980 edition.
In 1980 Günther Hellwig listed 139 instruments, while the new publication describes 169 surviving instruments and fragments. To this end, Friedemann and Barbara Hellwig re-examined all instruments (except for a few which were not accessible); they deleted three bows and one violin as non authentic; and they added thirty-four new objects which came to their knowledge. All instruments and fragments are given a systematic TieWV number (TieWV = Tielke Werkverzeichnis) in chronological order. All were examined in detail, measured, photographed, and in some cases given different dates from those in the 1980 edition. More recent technology like dendrochronology, computed tomography, and 3D imaging derived from the CT shots were studied for additional information. Chemical analysis of varnish was also completed...