[en] This is an interim report of the research program 'Comparisons between computational and experimental elastic-plastic results' started at the Technical Research Centre of Finland in 1981. In the fist part of the program, a two dimensional linear elastic finite element analysis of specimen geometries (CT, RCT, ASTM-3P and Charpy) was performed. In the second part of the program, both testing and elastic-plastic analysis of specimen HGP 71 (1TCT, material A542) was performed. Additional elastic-plastic work on different materials and specimen geometries will be done in the future. The following comparisons are presented in the report: elastic compliances (computational, experimental and compliance functions), load vs. load line displacement curves, key curves, J-integral, crack opening displacement (COD), J vs. COD and the size of the plastic zone. To allow for the effects of ductile tearing three different crack lengths were used in the elastic-plastic analysis. (author)