Some key results of a benchmark test, initiated in 1992 by the Working
Group 2 of COST Project 240 at a modelling workshop in Teupitz, Germa
ny, are presented. A great number of BPM algorithms, such as the FTBPM
, various types of FD-BPMs, wide angle approximations and adaptive FE-
BPM are compared. The quasi-analytic character of the benchmark tests
gains a deeper insigth into the absolute accuracy,