Three related steam injection problems are presented along with simulation results for them obtained from six organizations. The problems selected for comparison were intended to exercise many of the features of thermal models that are of practical and theoretical interest. The first problem deals with three cycles of cyclic steam injection and the other two problems deal with steam displacement in an inverted nine-spot pattern. The first two problems are of ''black-oil'' type and the third of compositional type. Complete data are presented for these problems. The comparison of solutions indicates good agreement for most of the results of importance in field operations.