A summary measure of average achievement in key dimensions of human development i.e. a long and healthy life, being knowledgeable and having a decent standard of living. This measure is then used to rank countries into four tiers of human development: low, medium, high or very high.
Below is a table to illustrate how five different countries rank in these key dimensions of human development and therefore the meausre of human development for those countries. As can be seen from the table the UK is classed as having a very high level of human development as the HDI measure is over 0.8. Whereas Nigeria has medium level of human development as the HDI measure is below 0.7.
