This User's Manual focuses on the fourth-grade round of data collection and data for the Early Childhood Longitudinal Study, Kindergarten Class of 2010-11 (ECLS-K:2011). It describes the study instruments and data collection procedures used in the spring 2015 collection. It also describes the kindergarten-fourth grade data file structure and variables created from data collected in the fourth-grade round. This manual is only available on the ECLS-K:2011 Restricted-Use Kindergarten-Fourth Grade Data File and Electronic Codebook CD.