The document discusses the concept of ekistics, which was coined by Greek architect and urban planner Konstantinos Apostolos Doxiadis. Ekistics refers to the science of human settlements and includes planning at the regional, city, community, and dwelling scales. It aims to create optimal sized cities that respect human needs and accommodate technological evolution. Doxiadis proposed a systematic classification of human settlements based on size, location, physical form, functions, evolutionary phases, and other factors. This would help systematically develop a science to guide the creation of future cities. The document provides various examples of how Doxiadis applied ekistics in projects such as the planning of Islamabad as the new capital of Pakistan.