Global economic transformations have never been as dramatic as in the twentieth century. Most countries have experienced radical changes in the standards of income per capita, technology, fertility, mortality, income inequality and the extent of democracy in the course of the past century. It is the goal of many disciplines--economics, history,…

This 4-year longitudinal study of logical reasoning found complex interrelationships among different cognitive processes of children ages 6 to 15. Piaget's stage theory is discussed in the introduction, with a focus on the concrete operational stage in middle childhood. In the study, a representative array of logical concept tasks and short-term…

Projecting demand for vocational education teachers for a 5-year period has many methodological problems. For example, how does one define the "need for additional personnel" or determine the difference in demand for and supply of teachers? The demand figure changes drastically depending on how it is measured, while the supply changes…