The central ➔ documentation website of TwinLife gives the user a quick overview of the study, its structure and documentation and provides information on how to handle the data. It largely corresponds to the contents of the ShortGuide. In addition to the ShortGuide, the data documentation website provides all documents mentioned in the ShortGuide in the ➔ Downloads section, including questionnaires, methodology reports as well as helpful syntax files, wave-specific and longitudinal overviews (e.g. ➔ ZA6701_longitudinal_overview_v4-0-0.xlsx). The tables contained in the latter describe specific facets of the main study domains surveyed in each year. They also include information on the family members and age groups that were questioned as well as information on the sources of the items and scales. Furthermore, the download section contains documentation of changes between the different data releases (e. g. ➔ ZA6701_changes_in_v4-0-0.pdf).