This document provides information about the Clock Drawing Test (CDT), including its history, administration, scoring, benefits and criticisms. The CDT was originally used to assess constructional apraxia but is now commonly used as a cognitive screening test. It involves asking a participant to draw a clock set to a specific time. Several scoring methods exist to evaluate aspects of the drawing like placement of numbers and hands. The CDT takes only two minutes and can provide insight into dementia severity, but it may lack sensitivity and specificity as a standalone screening tool.