Abstract- The Cognitive Abilities Screening Instrument (CASI) has been commonly used in dementia research and clinical practice to evaluate a subject's cognitive abilities and to follow-up possible progression of dementia. It has a detailed manual for test administration and scoring in order to minimize testing errors. The Chinese version of CASI (CASI C-2.0) has been used in many clinical and epidemiological studies in Taiwan. Since cognitive abilities are influenced by education, and there are high rates of illiterate or low education individuals among the elderly in Taiwan, the normative data of CASI, including its total score and its cognitive domain scores, should be divided into different education ranges. In clinical practice, the cut-off scores in differentiating between dementia and normal are suggested to be: 49/50 for Education year = 0; 67/68 for Education years = 1-5; and 79/80 for Education years more than 6.