The ability to remain mobile is an essential aspect of quality of life and is critical for the preservation of independence in old
age. One of the cornerstones of comprehensive geriatric assessment is the evaluation of functional and mobility status, because it provides
clinicians pivotal information on overall health status, quality of life, needs for formal and informal care, and short and long term
prognosis. As a consequence, many assessment tools have been developed and proposed for clinical use, including simple self-report
measures assessing basic abilities and more complex and challenging performance-based objective tools. Both self-report and objective
measures might be used to investigate specific steps of the age-related disablement process. In general, self-report and performance based
instruments should not be used interchangeably, since they provide different and complementary information. Selection of the more appropriate
tool strongly depends on clinical setting, patient characteristics, and clinical or research objective.