The National Sample Survey Office (NSSO) in India uses different concepts to measure unemployment. The Usual Status (US) approach measures the activity status of a person over a long reference period (typically 365 days). It identifies individuals who are unemployed for a relatively longer duration, thus reflecting chronic or long-term unemployment. The Current Weekly Status (CWS) and Current Daily Status (CDS) measure unemployment over shorter reference periods (7 days and per day, respectively), capturing transient unemployment and underemployment.