This document provides background information on the history and development of Chandni Chowk area in Old Delhi. It discusses the original layout when it was built in the 17th century, the demographic changes over time, and various planning authorities and their plans. The document outlines the objectives to assess housing, drainage, sanitation and water supply infrastructure in Dariba Kalan lane, and the methodology which includes secondary research, site visits, surveys of residents, shopkeepers and commuters, and analysis of gaps in existing and required urban services. It provides details on the scope, limitations and stakeholder groups for the survey.