LEVEL 1: Indispensable in JCOG geriatric research G8 (screening tool) LEVEL 2: Recommended for geriatric research Instrumental activities of daily living (IADL), Charlson Comorbidity Index (CCI), MINI-COG, social situation LEVEL 3: Chosen according to study characteristics Activities of daily living (ADL), Mini Nutritional Assessment (MNA), Mini-Mental State Examination (MMSE), Geriatric Depression Scale (GDS), medication, social support, geriatric syndrome (e.g., falls, delirium, incontinence, osteoporosis)