The guide is designed for teachers in adult basic education and General Educational Development classes, as an aid for identifying potential limited-English-proficient (LEP) students, assessing their English proficiency in all language skill areas, observing classroom behaviors that might impede comprehension, and planning appropriate instruction. It consists of five parts. The first is a teacher observation checklist for classroom use. The second is an English language skill assessment tool consisting of an oral language test (giving short answers, answering open-ended questions, and storytelling), a reading skills test (letter recognition, word recognition, sentence reading, and paragraph reading), and a writing skills test (letter and word writing and sentence dictation). Test administration instructions, student answer sheets, and a scoring guide are included. Part three is a behavior checklist for teachers to use in assessing whether and how they are improving their comprehensibility in classroom communication. Part four offers strategies for planning instruction for students of diverse language abilities. The final part is an instructional planning checklist for the teacher. (MSE) (Adjunct ERIC Clearinghouse on Literacy Education)