After randomization, RTs in participating ICUs will be informed of the allocated study arm and bedside nurses will complete a checklist that documents practices related to sedation, analgesia, delirium, and mobilization before each screening period in both study arms. RTs will conduct weaning readiness assessments either 'once daily' or 'at least twice daily' as per group assignment. The checklists, completed by bedside nurses, will merely record current practices in sedation, analgesia and delirium management, and whether patients are being passively or actively mobilized before SBTs.