It is scarcely less difficult or costly to train teachers, accountants or professionals with other lost skills. Yet much of this is qualitative and not measurable. In both Samoa and Tonga, science and mathematics teachers from secondary schools are the ones most often lost, partly through migration and partly from attrition, since sciences and mathematics teachers are most easily able to find better paid jobs within the public sector. In Tonga, the loss of industrial arts and technical and vocational education and training teachers is a particular problem.