A time-and-motion study combines two complementary techniques: time study, which measures how long a task takes, and motion study, which analyzes the physical or procedural steps used to perform it. The pairing originated with Frederick W. Taylor's Principles of Scientific Management (1911) and the parallel work of Frank and Lillian Gilbreth, who broke manual tasks into elemental motions they called "therbligs."
In a typical study, an observer records the duration of each sub-task with a stopwatch or, today, with video and digital timing software. Each motion is then evaluated for necessity, sequence, and ergonomic efficiency. Redundant or fatiguing movements are eliminated, and a standard time is calculated, often including allowances for rest, delay, and personal needs. The resulting standard becomes the basis for staffing levels, production targets, piece-rate pay, and process redesign.
For policy researchers and MUN delegates, the relevance is twofold. First, time-and-motion methods underpin productivity statistics used by bodies such as the ILO and the OECD, and they shape labor regulations on working hours, breaks, and workload. Second, the technique has been adapted well beyond factories: hospitals use it to study clinician workflow, courts to measure case processing, and humanitarian agencies to benchmark distribution operations. The WHO and academic public-health literature regularly publish time-and-motion studies of nurses and community health workers to inform staffing policy.
Critics note ethical and methodological limits. Observation can alter behavior (the Hawthorne effect), standards set by short studies may not capture variation, and reducing work to measurable motions has long been criticized — including by trade unions and by writers such as Harry Braverman in Labor and Monopoly Capital (1974) — as deskilling and intensifying labor. Modern practice therefore typically combines time-and-motion data with worker interviews, ergonomic assessment, and statistical sampling techniques such as work sampling.
Example
In 2018, researchers published a time-and-motion study in BMJ Open tracking how emergency-department physicians in several hospitals divided their shifts between direct patient care, documentation, and electronic health record use.
Frequently asked questions
It emerged from Frederick W. Taylor's time studies and Frank and Lillian Gilbreth's motion studies in the early 1900s; the two approaches were later merged into a single methodology.
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