This project aims to clean and systematically code existing text data on parental occupation (mother and partner), which were collected at when teh ALSPAC children were aged 10/11. The rational of this exercise is to provide the CLOSER collaboration with harmonised parental social class and occupational data. This will maximise data availability by increasing the pool of available occupational and social class data already harmonised between the CLOSER cohorts, and will permit greater cross-cohort analyses by individuals interested in utilising such data in their research projects. As the only main cohort currently without available occupational and social class data at this key life stage this project seeks to make a major contribution to the availability of key-variable harmonised data within the CLOSER group.