In the fall of 2020, ACT and the Mississippi Community College Board (MCCB) entered into a data sharing agreement in order to examine the validity of ACT's® WorkKeys® Assessments. WorkKeys Assessments measure students' foundational workplace skills. The focus of this technical brief is to summarize the results of several validity studies using a sample from MCCB. This brief examines three different types of validity: (1) convergent; (2) discriminant; and (3) criterion-related. To examine convergent and discriminant validity, the relationship between WorkKeys and the Test of Adult Basic Education (TABE) was examined. To assess criterion-related validity, the relationships between WorkKeys and several educational outcomes were examined.