 The Clock Drawing test CDT is an additional test employed to evaluate the global cognitive state of patients and is considered complementary to the MMSE. To perform the CDT the patient is asked to draw a circle in order to symbolize a clock face. Furthermore the patient is asked to draw the watch hands in order to indicate ten past eleven. The test explores the visual-spatial, practical and executive functions of the patient. The maximal obtainable score is 55 and requires the presence of all numbers, drawn in the correct order and close to the border of the clock face, with the correct symmetry and the watch hands correctly showing ten past eleven. The presence of extra numbers, segmentation lines or rotation of the numbers determines the subtraction of 1 point to the score. Scores 35 are considered normal. 