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These data are children ages 2 through 5, includes preschool, child, and family demographic characters, social and emotional skills, cognitive skills, early math, early reading, and other indicators of kindergarten readiness (e.g., approaches to learning). Data were collected via director child assessments and teacher report. Direct child assessments were collected once in the fall whereas teacher reports were collected once in the fall and once in the spring.

These data are parent reports of survey questions about their beliefs and their children's home learning environments. Data are cross-sectional and include responses from parents with children ranging from 0 - 13 years of age.

These data include information on family demographics, home environment, health information, child diet and nutrition, BRIEF, SWAN, all at the item level. This is cross-sectional data. Data can be linked to other Project KIDS data through the PK_ID variable.

This dataset contains results from the initial survey assessment completed by parents and twins (who were 9 years or older) regarding the twin pair's environments and behaviors (2010). T

This dataset contains measures from the third wave of data collection of the twins' achievement (collected in 2016). Data was collected via parent assessment using instructions sent in the mail.

This dataset contains measures from the second wave of data collection of the twins' achievement (collected in 2014). Data was collected via parent assessment using instructions sent in the mail.

This dataset contains measures from the first wave of data collection of the twins' achievement (collected in 2012). Data was collected via parent assessment using instructions sent in the mail.

This dataset contains results from the third wave of surveys sent to parents of twin pairs in 2016. In these surveys, parents were asked to rate themselves, their home, and their twins on various questionnaire measures including: family demographic measures (parent education, household income, etc.), home environmental measures (home literacy environment, family routines, CHAOS, etc.), family history (Colorado Learning Disabilities Questionnaire), and various behavioral measures (ADHD ratings, internalizing and externalizing behaviors, executive function, etc).

This dataset contains results from the second wave of surveys sent to parents of twin pairs in 2014. Within said surveys, parents were asked to rate themselves, their home, and their twins on various questionnaire measures including: family demographic measures (parent education, household income, etc.), home environmental measures (home literacy environment, family routines, CHAOS, etc.), family history (Colorado Learning Disabilities Questionnaire), and various behavioral measures (ADHD ratings, internalizing and externalizing behaviors, executive function, etc).