Workplace Panel Survey 2002 (WPS 2002) and Workplace Panel Survey 2003 (WPS 2003) were conducted in 2002 and 2003. Workplace Panel Survey 2005 (WPS 2005) was newly sampled in 2005 and is to be used for the subsequent biyearly surveys. The population of the WPS 2005 includes workplaces across the country with 30 or more employees, and the surveys are conducted with 1,700 sample workplaces sampled to represent workplaces in Korea using stratified sampling. Further, WPS 2005 conducted a research on about 200 representative workplaces in the public sector designated by the Ministry of Planning and Budget. In total, WPS 2005 includes about 300 workplaces in the public sector.
