The document discusses various concepts related to development and underdevelopment including definitions, indicators, and indexes. It provides definitions for key terms like development, underdevelopment, and sustainable development. It outlines several economic and non-economic indicators used to measure development, including GDP, life expectancy, literacy rates, HDI, and GDI. It notes both advantages and disadvantages of different indicators. Composite indexes like the HPI and PQLI that incorporate multiple variables are discussed as attempts to provide a more comprehensive view of development.