Teaching Strategies GOLD Assessment System (GOLD) is a formative assessment system that has been designed and extensively validated for use with young children ages birth to kindergarten. For a thorough review of the process of developing the measure and the existing research evidence to support the use of the measure, see existing research articles and the 3rd edition of the GOLD Technical Manual (Lambert, Kim, and Burts, 2013; Lambert, Kim, and Burts, 2014; Lambert, Kim, and Burts, 2015). This report focuses on establishing reliability and validity evidence for the Birth to Third Grade (B-3) version of the assessment system.