The high incidence of expatriate U.S. managers' being unable or unwilling to complete their overseas assignments suggests that more needs to be done to prepare those managers and their families.
Shay, J. P., & Tracey, J. B., (1997). Expatriate managers: Reasons for failure and implications for training. Cornell Hotel and Restaurant Administration Quarterly, 38(1), 30-35. doi:10.1016/S0010-8804(97)87489-7