Why your offshore test team cannot perform (well)?

Companies have been off-shoring work due to cost advantages and unavailability of local personnel as well as for mitigating risk and due to other practical compulsions. However, over the years I have heard about numerous instances when the offshore test team was unable to perform well. The issues in the performance of the offshore test team have the potential of breaking down the entire communication between the on-site team and the off-shore team. The presence and severity of these issues depend on