The CQELL observation protocol and accompanying CQELL codebook, "What is CQELL?", and training materials, together with this Technical Manual, are offered as a resource for research and for the improvement of classroom practice in the service of English Learners. The evidence presented here, though limited, supports the claim that the CQELL scale reliabilities compare favorably with those of other established classroom observation protocols. It is the hope of the authors of this report that the CQELL will prove to be a useful tool for these and other purposes.