Because the current reform movement in education stresses the need for performance-based student assessments, it is imperative to train teachers to conduct the most appropriate and effective performance-based assessments of English language learners (ELLs). Accordingly, the purpose of this trainer's manual is to assist the teacher educator in conducting workshops for teachers using the guidebook, "Assessment: A Development Guidebook for Teachers of English Language Learners," and the related workshop materials. The general purpose of this training manual is to help the teacher educator provide teachers of ELLs with information on the six most important aspects of assessment development: proven reform initiatives; content and performance standards; guidelines to consider when assessing ELLs; use of testing accommodations with ELLs; mechanisms that could be used when initially identifying ELLs; and elements to be included in databases for ELLs. More specifically, the teacher educator must learn to provide teachers of ELLs with the following: criteria that could be included in the development of performance based assessment tasks; checklists of criteria related to specific content standards; scoring rubrics; sample performance-based tasks; and sample scoring sheets. This manual provides numerous sample checklists, scoring sheets, testing rubrics, and three appendices containing workshop overhead transparencies, workshop checklists, and sample performance-based tasks. (KFT)