This is an application to clean the self-harm data from the CCS questionnaire, in order to provide consistent data for the resource. This work is essential to ensure accuracy of the data and to provide consistency - both across projects, and across waves of data collection. Although some of the data has been cleaned previously, the changes have not been assimilated into the main ALSPAC dataset. We would like to finish off this work by cleaning the remaining items, and coding the free-text responses