This guidance notice is intended to encourage the effective use of assessment instruments within the workforce investment system to promote efficient investment in talent development that will drive regional economic competitiveness; provide guidance to the workforce investment system and its partners on effective use of assessment instruments; and release and transmit a new technical assistance resource, Testing and Assessment: A Guide to Good Practices for Workforce Investment Professionals (the Guide). This is the third in a series of Testing and Assessment Guides (see Section 2. References), which was initiated based on requests from workforce investment officials. This guidance notice and the attached new technical assistance guide are designed to support the workforce investment system in promoting talent development by ensuring that individuals served are able to make well-informed education and career choices.