Miriam, Any company will make a significant investment in recruiting and training a new employee to bring them to the point where they are productive. If they leave, the company may never recoup on that investment. As you say, sometimes positions will require a particular certification or experience that may not be easy to come by and will require more work/investment to recruit qualified candidates. Then there is the company history that walks away with an employee as well. Attrition is natural and expected but when it becomes excessive, it carries a significant cost for the company. Pat Pat