This report was undertaken to help the Tennessee State government comply with federal requirements that all states collect valid, reliable, and uniform data for programs receiving federal funds as English-as-a-Second-Language (ESL) adult education programs. Data must be collected to report learner gains in reading, writing, speaking, and listening, along with additional skills related to workforce assessment. Two assessment instruments were considered: the Oral Basic English Skills Test (BEST) and the CASAS. The Oral BEST is designed for adult ESL learners at the survival and pre-employment skills level. It uses real life materials and tasks to measure performance of basic language competencies. The CASAS is an older test, and is already well-established and accepted as a valid and reliable assessment tool. For reasons provided in detail, it is concluded that the Oral BEST test would be the better choice by the Tennessee state government to use in fulfillment of federal requirements. (Included in this document are various letters, summary sheets, and memoranda expressing opinions about one or both of these assessment tools.) (KFT)