Considering the specific challenges that are currently being faced by the U.S. branch of the Singaporean Software company, I would recommend that the Kotter's change management model for the change process. The reason why I am recommending this model is that it is supported by research, in which it specifically highlights its effectiveness in driving large-scale organizational change, alignment with the need for improved communication as well as better collaboration between the U.S. branch and the Singaporean branch