2005 – Med Jones of the International Institute of Management introduced the first GNH Index and Global GNH Index Survey. The GNH Index, also known as Gross National Well-being (GNW) Index framework served as the first integrated objective (economic) and subjective (happiness) socioeconomic development framework. Prior to the GNH Index, there were few development indices that improved upon the gross domestic product (GDP), but did not measure happiness. For example, the Genuine Progress Indicator was focused on the environmental cost of economic development, then later (in 2006) it was updated to include similar measures to the GNH Index. Another development index is the Human Development Index (HDI) that originally focused on literacy and education but also did not measure happiness. The HDI now measures three basic dimensions of human development, health (as measured by life expectancy at birth), overall knowledge level (as measured by the literacy rate), and standard of living (as measured by GDP per capita for a given year). Among the criticisms of the HDI is the complaint that it is a mixture of stock measures (life expectancy at birth and literacy rate) and a flow measure (GDP per capita for a given year). To overcome this criticism, Hou, Walsh, and Zhang (2015) proposed a new index called HDIF (Human Development Index Flow), in which they replaced life expectancy at birth by the under-five mortality rate (for a given year), and they also replaced the literacy rate by the gross primary school enrollment ratio for a given year). They calculated both the HDI and the HDIF for many countries and found that "the HDIF and the HDI tend to converge for wealthy countries and diverge for poor countries, especially those with low HDI rankings". The development performance of poor countries improved using the HDIF while the performance of the wealthy countries declined.