The fieldwork for IHDS I was carried out by 24 collaborating institutions under the supervision of the National Council of Applied Economic Research (NCAER), New Delhi. Locally knowledgeable and linguistically fluent interviewers were hired by the collaborating institutions and trained by senior project personnel from NCAER and the University of Maryland. A team of one male and one female interviewer visited each home; women respondents were interviewed by women interviewers whenever possible. Fieldwork began in November 2004 and was mostly completed by October 2005.