This is an observational study designed to build a registry that will provide information on regimens used to treat chronic lymphocytic leukemia (CLL) or small lymphocytic lymphoma (SLL). Sometimes CLL and SLL can return (relapse) after treatment, or get worse (progress) during a course of treatment. If this happens, a new treatment is needed. The registry will collect information from patient's regular care medical records for review and study: patient's medical history and medications, cancer treatment and side effects, the results of patient's regular care laboratory tests, and the results of cancer care and treatment procedures performed as part of regular care. The registry study will also collect information on how out-of-pocket costs impact cancer care and treatment. The registry that will be built from information gathered from this study can help doctors decide what to do in situations when a new treatment is needed. Importantly, they can also gather information to help doctors learn which treatments are most effective in these situations.