CMO No. 4, Series of 2023 updates the guidelines for onsite learning in higher education. The memorandum provides revised protocols and standards for in-person classes and activities, addressing health and safety measures, physical distancing, and sanitation practices. It includes guidance on classroom management, student attendance, and faculty responsibilities to ensure a safe and effective learning environment. The update aims to adapt to current public health conditions and educational needs, facilitating a safe return to or continuation of onsite instruction while maintaining high educational standards.