Time diary aggregate files for both CDS-I and CDS-II, which "roll-up" individual activities in several ways: at the four-digit (for CDS-II) and three-digit code levels, which take all of the time spent in each of the activities and sum them across the diary day, and at the two-digit level, which aggregate time per diary day by 38 activity categories, as delineated in the codebook posted on line (http://psidonline.isr.umich.edu/CDS/Codebooks/2003codebook.pdf). These aggregate files will be posted at the child-level, facilitating their use with developmental data from the other CDS modules. For CDS-II, there are aggregated time use data available for 2,569 target children/youth; for CDS-I, aggregated time use data are available for 2,904 CDS children.