I think there are 2 prospective to look at. One is called bilateral approach and the other one is unilateral approach. Bilateral approach emphasizes on understanding each other and communicate to ensure all parties reaching certain consensus. On the other hand, unilateral approach will go according to what the acquiring company wanted to be and target company staff have to follow and adopt to the new ways/culture of doing things gradually. Whoever failed to adopt, they have to go as they are not fitting into overall direction of the acquiring company. Change management can be applied in both approaches. Under bilateral approach, more resources might have to be applied in bilateral communication to achieve certain consensus. under the unilateral approach, more works on giving clear guide lines, reviewing and damage control if there is any.