ChildTrends’s new brief entitled Researchers Should Understand and Adapt Race and Ethnicity Data That Change Over Time suggests that researchers looking to examine outcomes for young people over time must consider how they use data in their analyses as individuals’ views about their racial and ethnic identity may change over time as they explore themselves. Ambiguity in how researchers handle data on youths’ chosen racial and ethnic identities may lead to inaccurate understandings of their experiences.