I have been saying for 10 years that in order to fairly evaluate shared services, you need to weigh the cost of migration against the potential savings. In March of 2015 the Partnership for Public Service published a report on shared services noting potential savings of up to $47B over 10 years. Buried deep in that report were the costs of migration, estimated by them to be between $6.5B and $14.5B. In real terms what this means is that in order to save any money at all you