This book studies the dynamic aspects of the Human Development Index (HDI) through a partial mobility perspective. It offers a new axiomatic structure and a set of mobility indices to discuss partial trends and interrogate the human development status at the subgroup and subregional levels. While traditional human development theories are primarily concerned with static distributions corresponding to a point in time, this book looks at an oft-neglected side of HDI and focuses on relative changes in human development that may not be captured by the absolutist framework. In addition, the authors also introduce the concepts ofjump and fractional mobility which aid in tracking the development and stagnation among various groups within a population. This work breaks fresh ground in the study of human development. It will be of great interest to scholars and researchers of economics, development economics, political economy, and development practitioners.