For some chosen constructs, the Twinlife data offer already generated aggregates of certain scales (e.g., intelligence, BMI, or zygosity). These aggregates have been constructed with extensive data preparation processes considering possible pitfalls of the data. These processes and procedures are documented in the ➔ TwinLife Technical Report series. In addition, TwinLife covers a broad variety of other scales and constructs that are established in social sciences. For these scales, TwinLife offers a ➔ scales manual containing detailed information on assessed constructs and scales and recommendations for potential aggregates. Also, we provide SPSS syntax for all scales mentioned in the scales manual in the ➔ Downloads section of the data documentation website.