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	Clock Drawing Test	Montreal Cognitive Assessment
Field	Social Gerontology	Rehabilitation
Family	Latent structure	Process / pipeline
Year of origin	2000	2005
Originator	Kenneth I. Shulman (synthesis and scoring) and earlier clinical neurologists	Nasreddine, Phillips, Bédirian
Type	Brief cognitive screening task for older adults	Cognitive screening test
Seminal source	Shulman, K. I. (2000). Clock-drawing: is it the ideal cognitive screening test? International Journal of Geriatric Psychiatry, 15(6), 548-561.	Nasreddine, Z. S., Phillips, N. A., Bédirian, V., Charbonneau, S., Whitehead, V., Collin, I., ... & Chertkow, H. (2005). The Montreal Cognitive Assessment, MoCA: a brief screening tool for mild cognitive impairment. Journal of the American Geriatrics Society, 53(4), 695–699.
Aliases	CDT, Clock-Drawing Test, Clock Test, Clock Completion Task	MoCA, MoCA Test, Montreal Cognitive Assessment Test
Related	3	1
Summary	The Clock Drawing Test (CDT) is a brief, widely used cognitive screening task in which a patient draws the face of a clock, places the numbers, and sets the hands to a specified time, most commonly ten past eleven. Despite its simplicity, the task draws on a wide network of cognitive abilities including visuospatial construction, executive planning, abstraction, and semantic memory, so that a poorly executed clock can be an efficient signal of cognitive impairment. In a frequently cited 2000 review, Kenneth Shulman asked whether clock drawing might be the ideal cognitive screening test, surveying its many scoring systems and its strengths and weaknesses. The drawing is rated with a scoring rubric that attends to the clock contour, the numbers, the placement and accuracy of the hands, and spatial or executive errors, and a low score flags the need for fuller assessment. Because it takes only a minute or two, requires only paper and pencil, and is relatively insensitive to language and education, the CDT is popular for screening older adults for dementia in clinics, hospitals, and community settings. It is typically used alongside, not instead of, broader instruments such as the Mini-Mental State Examination or the Montreal Cognitive Assessment.	The Montreal Cognitive Assessment (MoCA) is a brief 10-minute cognitive screening test designed to detect mild cognitive impairment (MCI) in older adults. Developed by Nasreddine and colleagues in 2005 at McGill University, MoCA is more sensitive to cognitive impairment than the Mini-Cog or MMSE, particularly for detecting early Alzheimer's disease and non-Alzheimer dementias, making it widely used in primary care, neurology, and geriatric medicine.