For comparative research, you'll need a statement/hypothesis that can potentially be falsified or verified. E.g. the question "Can USM be considered a disruptive step in the evolution of service management?" can be turned into "USM can be considered a disruptive step in the evolution of service management." This will require analysis of:
Sources:
Another approach:
Investigative research could investigate the question "which considerations could an organization use to select USM as their strategic approach to service management". This would leave you with an analysis of all benefits and costs of introducing USM.
Think about the resulting paper: what doe want it to be, how doe want to use it?