Otherwise expectations are likely to be disappointed, and disappointed expectations may lead to building pressure for alternative policy actions, which may not in the event be in our longer-term economic interest." This view on what monetary policy can do - and more important what it cannot do - is basically shared by all major central banks.
Based on this "common understanding", central banks are thus likely to come to very similar conclusions on the appropriate course of policy given the respective mandates and prevailing conditions in the respective economies. Concerted actions should not come into conflict with the mandates and monetary policy strategies pursued by the participating central banks.