The current official policy is that 1 production VM image = 1 license. We make exceptions in cases where there are multiple images that serve the same users for historical reasons (ie in cases where the images would be merged given enough time and manpower, typically when the university used to have two of the biggest S/390 models because one didn't have enough horsepower to get the job done, and now they have been merged into one physical box). The problem is that we do not charge based on model group number. So, if you have a big machine that is physically partitioned to run multiple systems, we do not receive more licensing revenues than if that machine was half the size and only ran one VM image. You can however get a maintenance discount if the two servers are managed by the same people. Eric