This project aims to develop and test a new questionnaire to measure how well children recover in the post-anaesthesia care unit (PACU). Currently, children in PACU are mainly assessed using discharge readiness criteria, but these do not fully capture the child's recovery experience or overall wellbeing. Participants will be children aged 2-17 years having elective procedures requiring anaesthesia or sedation, and their parents/caregivers where proxy reporting is needed for younger children. The study will be conducted in stages, including interviews to identify important aspects of recovery, expert review of draft questions, testing of question clarity and acceptability, and field testing of the questionnaire in PACU at planned time points during recovery. Clinical information routinely collected as part of care, such as pain scores, nausea vomiting, airway or oxygen events, and length of stay in PACU, will also be examined to assess how well the questionnaire performs. The expected outcome is a child-centred, practical, and reliable PACU recovery measure that can be used in clinical care, quality improvement, and future research.