OASIS (Outcomes and Assessment Information Set) is the standardized assessment tool used by clinicians to measure patient care quality and outcomes during the patient’s episode of care. Over the years, OASIS has required changes to the data set to align with evolving regulatory requirements. The newest version, OASIS-E, will be a big change for clinicians. Agencies need to assess their clinicians’ overall baseline knowledge of OASIS and their comprehension of its rationale and intent. It will be imperative to provide training to clinicians, including RNs and therapists.