SummaryRecovery is an abstract quantity the definition of which varies according to the pre-dilection of individual institutions, clinicians or patients. While traditionally focused on immediate postoperative restitution of function and readiness for discharge, recovery assessment has progressively expanded its focus to include other clinically relevant time periods, each of which is influenced by specific factors. Assessment tools have progressed from assessing one dimension of recovery, such as physiological variables, to multidimensional assessment of physical, nociceptive, emotive, functional and cognitive performance. They should be validated ideally for repeat measures and should provide realtime recovery data, as recovery can be viewed as a continuous process. Recovery time periods -relevance, influences and focus Postoperative recovery is complete when function is restored and adverse symptoms have resolved. Function and symptoms can be assessed at time points considered significant by the patient, clinician or institution.The outcomes of the 'enhanced recovery after surgery' pathways were initially determined by clinicians rather than patients, and emphasised what happened in hospital -length of hospital stay, complications and early organ dysfunction [1]. However, reductions in length of hospital stay and complications associated with the enhanced recovery pathway are of limited interest to patients [2,3]. Patients rarely achieve normal levels of function and are usually symptomatic on discharge after major surgery, the timing of which is influenced by organisational factors and correlates poorly with longer term recovery [1,2].Postoperative enhanced recovery, as a process and as an endpoint, is now assessed during three stages: from the end of surgery to discharge from the postanaesthetic care unit; from then until hospital discharge; and, finally, until normal function has been restored. Simple physiological variables predominantly influence the first stage. The second and third stages are predominantly influenced by pain, more complex physiology and function.Tools generated by clinicians from various specialties, rather than just surgery, also define recovery over three phases, their cumulative duration exceeding 72