Dear Marcus Wright, Thank you for visiting the KOSIS website. Sorry to say, Statistics Korea doesn't provide survey methodologies in English. For instance, birth statistics are produced on the basis of birth reports that Koreans submit to local governments according to the Statistics Act and the Act on the Registrations, etc. of Family Relationships. And metadata of vital statistics are found only in Korean on the following webpage of the KOSIS.: - Statistical metadata (meta.narastat.kr) > Metadata by topic > Population & Households > Vital Statistics https://meta.narastat.kr/metasvc/index.do?orgId=101&confmNo=101003&kosisYn=Y Thank you.