The scientific study of man and his working environment is known as

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The correct option is 2:

Ergonomics is the scientific discipline precisely defined as the study of the interaction between humans and other elements of a system, applying theory, principles, data, and methods to design in order to optimize human well-being and overall system performance. The term itself is derived from the Greek words *ergon* (work) and *nomos* (laws), essentially meaning "the laws of work." Fundamentally, the core premise of ergonomics is to "fit the job to the person," rather than forcing the person to adapt to an unsuitable work environment, tool, or task. This scientific study is holistic, encompassing three main domains: **physical ergonomics** (concerned with anatomical and physiological characteristics, like posture, materials handling, and repetitive movements to prevent Musculoskeletal Disorders or WMSDs), **cognitive ergonomics** (concerned with mental processes like perception, memory, and reasoning as they affect human-system interaction), and **organizational ergonomics** (concerned with sociotechnical systems, including teamwork and work design). Ergonomics draws on various scientific fields, including anthropology, physiology, and psychology, to ensure that tasks, equipment, and the environment are compatible with human capabilities and limitations, thereby maximizing safety, efficiency, and comfort.

The incorrect option is 1:

Demography is the statistical study of human populations, primarily focusing on its size, structure, distribution, and changes over time due to birth, death, migration, and aging. Its focus is on broad population dynamics and quantitative data about groups of people. For instance, demographers would study the aging workforce trend or migration patterns that affect labor supply. Demography provides macro-level data about a population, but it does not involve the scientific analysis of a specific individual's physical, cognitive, or biomechanical interaction with their immediate workplace environment. The field is descriptive and analytical of population statistics, not prescriptive in terms of designing the human-machine interface or the task itself. Thus, while demographic trends might be relevant to an ergonomist's assessment of a population, demography itself is not the scientific study of the *man and his working environment* in a design context.

The incorrect option is 3:

Work simplification is a specialized technique or process aimed at reducing the effort and time required to perform a task. It is a tool within the broader field of industrial engineering and home management, used to eliminate unnecessary movements and delays (often referred to as 'waste'). Examples of work simplification tools include process charts, motion economy principles, and micromotion study, all aimed at finding the most efficient way to complete a task. While it shares the goal of improving efficiency with ergonomics, work simplification is a focused management *method*, not the comprehensive *scientific discipline* of studying the human-environment interaction itself. The scientific principles of ergonomics (such as working in a neutral position) inform *how* work simplification methods are developed and practically applied. Therefore, work simplification is better categorized as an application or result of human factors principles, rather than the overarching study.

The incorrect option is 4:

Occupational health is a multidisciplinary field within public health that aims to promote and maintain the highest degree of physical, mental, and social well-being of workers in all occupations. Its main objective is the prevention of disease and injury caused by working conditions, and the protection of workers from health risks in the workplace. Occupational health is a broad field of medicine and public safety that manages the overall health and safety program within an organization. While intimately related to the working environment, it is the *field* concerned with worker well-being, whereas ergonomics is the *design science* that provides the practical, engineering, and design solutions to achieve those health goals. Ergonomics provides the methodology for proactively modifying the work environment to eliminate hazards, a crucial component of achieving good occupational health, but the question asks for the name of the specific scientific *study*.