The Society for Industrial and Organizational Psychology (SIOP) is pleased to offer the fifth edition of the Principles for the Validation and Use of Personnel Selection Procedures, which was approved by the APA Council of Representatives in August 2018 as an authoritative guidelines document for employee selection testing and an official statement of the APA. Over a three-year period, the Principles Revision Committee updated this document from the fourth edition to be consistent with the 2014 Standards for Educational and Psychological Testing, invited commentary from SIOP and APA that informed subsequent revisions, and solicited a thorough legal review.