- mass production
the production or manufacture of goods in large quantities, esp. by machinery.[1915-20]
* * *Application of the principles of specialization, division of labour, and standardization of parts to the manufacturing of goods on a large scale.Modern mass-production methods have led to such improvements in the cost, quality, quantity, and variety of goods available that the largest global population in history is now sustained at the highest general standard of living ever. The requirements for mass production of a particular product include the existence of a market large enough to justify a large investment; a product design that can use standardized parts (see interchangeable parts) and processes; a physical layout that minimizes materials handling; division of labour into simple, short, repetitive steps (see time-and-motion study); continuous flow of work; and tools designed specifically for the tasks to be performed. See also assembly line.
* * *▪ industryIntroductionapplication of the principles of specialization, division of labour, and standardization of parts to the manufacture of goods. Such manufacturing processes attain high rates of output at low unit cost, with lower costs expected as volume rises. Mass production methods are based on two general principles: (1) the division ond specialization of human labour; and (2) the use of tools, machinery, and other equipment, usually automated, in the production of standard, interchangeable parts and products. The use of modern methods of mass production has brought such improvements in the cost, quality, quantity, and variety of goods available that the largest global population in history is now sustained at the highest general standard of living.The Industrial Revolution and early developmentsThe principle of the division of labour (labour, division of) and the resulting specialization of skills can be found in many human activities, and there are records of its application to manufacturing in ancient Greece. The first unmistakable examples of manufacturing operations carefully designed to reduce production costs by specialized labour and the use of machines appeared in the 18th century in England. They were signaled by five important inventions in the textile industry: (1) John Kay's (Kay, John) flying shuttle in 1733, which permitted the weaving of larger widths of cloth and significantly increased weaving speed; (2) Edmund Cartwright's (Cartwright, Edmund) power loom in 1785, which increased weaving speed still further; (3) James Hargreaves' (Hargreaves, James) spinning jenny in 1764; (4) Richard Arkwright's (Arkwright, Sir Richard) water frame in 1769; and (5) Samuel Crompton's (Crompton, Samuel) spinning mule in 1779. The last three inventions improved the speed and quality of thread-spinning operations. A sixth invention, the steam engine, perfected by James Watt (Watt, James), was the key to further rapid development. After making major improvements in steam engine design in 1765, Watt continued his development and refinement of the engine until, in 1785, he successfully used one in a cotton mill. Once human, animal, and water power could be replaced with a reliable, low-cost source of motive energy, the Industrial Revolution was clearly established, and the next 200 years would witness invention and innovation the likes of which could never have been imagined.In 1776 Adam Smith (Smith, Adam), in his Wealth of Nations, observed the benefits of the specialization of labour in the manufacture of pins. Although earlier observers had noted this phenomenon, Smith's writings commanded widespread attention and helped foster an awareness of industrial production and broaden its appeal.The next major advance was made in 1797 when Eli Whitney (Whitney, Eli), inventor of the cotton gin, proposed the manufacture of flintlocks (flintlock) with completely interchangeable parts, in contrast to the older method under which each gun was the individual product of a highly skilled gunsmith and each part was hand-fitted.During the same period similar ideas were being tried out in Europe. In England Marc Brunel (Brunel, Sir Marc Isambard), a French-born inventor and engineer, established a production line to manufacture blocks (pulleys) for sailing ships, using the principles of division of labour and standardized parts. Brunel's machine tools (machine tool) were designed and built by Henry Maudslay (Maudslay, Henry), who has been called the father of the machine tool industry. Maudslay recognized the importance of precision tools that could produce identical parts; he and his student, Joseph Whitworth, also manufactured interchangeable, standardized metal bolts and nuts.By the middle of the 19th century the general concepts of division of labour, machine-assisted manufacture, and assembly of standardized parts were well established. Large factories were in operation on both sides of the Atlantic, and some industries, such as textiles and steel, were using processes, machinery, and equipment that would be recognizable even in the late 20th century. The growth of manufacturing was accelerated by the rapid expansion of rail, barge, ship, and road transportation. The new transport companies not only enabled factories to obtain raw materials and to ship finished products over increasingly large distances, but they also created a substantial demand for the output of the new industries.At this point in the Industrial Revolution, the methods and procedures used to organize human labour, to plan and control the flow of work, and to handle the myriad details on the shop floor were largely informal and were based on historical patterns and precedents. One man changed all of that.Pioneers of mass production methodsIn 1881, at the Midvale Steel Company in the United States, Frederick W. Taylor (Taylor, Frederick W.) began studies of the organization of manufacturing operations that subsequently formed the foundation of modern production planning. After carefully studying the smallest parts of simple tasks, such as the shoveling of dry materials, Taylor was able to design methods and tools that permitted workers to produce significantly more with less physical effort. Later, by making detailed stopwatch measurements of the time required to perform each step of manufacture, Taylor brought a quantitative approach to the organization of production functions.At the same time, Frank B. Gilbreth (Gilbreth, Frank Bunker) and his wife, Lillian M. Gilbreth (Gilbreth, Lillian Evelyn), U.S. industrial engineers, began their pioneering studies of the movements by which people carry out tasks. Using the then new technology of motion pictures, the Gilbreths analyzed the design of motion patterns and work areas with a view to achieving maximum economy of effort. The “time-and-motion” studies of Taylor and the Gilbreths provided important tools for the design of contemporary manufacturing systems.In 1916 Henri Fayol, who for many years had managed a large coal mining company in France, began publishing his ideas about the organization and supervision of work, and by 1925 he had enunciated several principles and functions of management. His idea of unity of command, which stated that an employee should receive orders from only one supervisor, helped to clarify the organizational structure of many manufacturing operations.Manufacturing pioneersMuch of the credit for bringing these early concepts together in a coherent form, and creating the modern, integrated, mass production operation, belongs to the U.S. industrialist Henry Ford (Ford, Henry) and his colleagues at the Ford Motor Company, where in 1913 a moving-belt conveyor was used in the assembly of flywheel magnetos. With it assembly time was cut from 18 minutes per magneto to five minutes. The approach was then applied to automobile body and motor assembly. The design of these production lines was highly analytical and sought the optimum division of tasks among work stations, optimum line speed, optimum work height, and careful synchronization of simultaneous operations.The success of Ford's operation led to the adoption of mass production principles by industry in the United States and Europe. The methods made major contributions to the large growth in manufacturing productivity that has characterized the 20th century and produced phenomenal increases in material wealth and improvements in living standards in the industrialized countries. (For a fuller survey of the development of labour and production line manufacture, see work, history of the organization of.)A summary of mass production conceptsThe efficiencies of mass production result from the careful, systematic application of the ideas and concepts outlined above. The following summary lists the basic principles of mass production:1. The careful division of the total production operation into specialized tasks comprising relatively simple, highly repetitive motion patterns and minimal handling or positioning of the workpiece. This permits the development of human motion patterns that are easily learned and rapidly performed with a minimum of unnecessary motion or mental readjustment.2. The simplification and standardization of component parts to permit large production runs of parts that are readily fitted to other parts without adjustment. The imposition of other standards (e.g., dimensional tolerances, parts location, material types, stock thickness, common fasteners, packaging material) on all parts of the product further increases the economies that can be achieved.3. The development and use of specialized machines, materials, and processes. The selection of materials and development of tools and machines for each operation minimizes the amount of human effort required, maximizes the output per unit of capital investment, reduces the number of off-standard units produced, and reduces raw material costs.4. The systematic engineering and planning of the total production process permit the best balance between human effort and machinery, the most effective division of labour and specialization of skills, and the total integration of the production system to optimize productivity and minimize costs.Careful, skilled industrial engineering and management are required to achieve the maximum benefits that application of these principles can provide. Planning begins with the original design of the product; raw materials and component parts must be adaptable to production and handling by mass techniques. The entire production process is planned in detail, including the flows of materials and information throughout the process. Production volume must be carefully estimated because the selection of techniques depends upon the volume to be produced and anticipated short-term changes in demand. Volume must be large enough, first, to permit the task to be divided into its sub-elements and assigned to different individuals; second, to justify the substantial capital investment often required for specialized machines and processes; and third, to permit large production runs so that human effort and capital are efficiently employed.The need for detailed advance planning extends beyond the production system itself. The large, continuous flow of product from the factory requires equally well-planned distribution and marketing operations to bring the product to the consumer. Advertising, market research, transportation problems, licensing, and tariffs must all be considered in establishing a mass production operation. Thus, mass production planning implies a complete system plan from raw material to consumer.In addition to lowering cost, the application of the principles of mass production has led to major improvements in uniformity and quality. The large volume, standardized design, and standardized materials and processes facilitate statistical control and inspection techniques to monitor production and control quality. This leads to assurance that quality levels are achieved without incurring the large costs that would be necessary for detailed inspection of all products.A major problem of mass production based on continuous or assembly line processes is that the resulting system is inherently inflexible. Since maximum efficiency is desired, tools, machines, and work positions are often quite precisely adapted to details of the parts produced but not necessarily to the workers involved in the process. Changes in product design may render expensive tooling and machinery obsolete and make it difficult to reorganize the tasks of workers. One answer has been to design machinery with built-in flexibility; for relatively little extra cost, tooling can be changed to adapt the machine to accommodate design changes.Similarly, a production line is usually designed to operate most efficiently at a specified rate. If the required production levels fall below that rate, operators and machines are being inefficiently used; and if the rate goes too high, operators must work overtime, machine maintenance cannot keep up, breakdowns occur, and the costs of production rise. Thus, it is extremely important to anticipate production demands accurately. Planning, an important function of management and engineering design, can alleviate the problems of increased demand by incorporating excess capacity in the facilities that would require the longest time to procure and install. Then, if production loads increase, it is easier to bring the entire system up to the new level. Similarly, if large fluctuations in demand cannot be avoided, flexibility to accommodate these changes economically must be planned into the system.At any given stage of technological development, the economies obtained by increasing production volume are largest in the initial stages of growth and level off as volumes are further increased. Indeed, if volumes grow too large, unavoidable breakdowns of facilities, failures of coordination, or other strategic factors may cause costs to rise. Advances in technology or changes in other factors can shift the optimum point to higher levels. For these reasons planners may limit the maximum size of a single production facility and construct an independent facility if greater production is necessary.The mass production of automobiles (automobile)The traditional example of mass production is the automobile industry, which has continued to refine the basic principles originally laid down by Henry Ford and other pioneers of mass production techniques. Today's automobile is the result of a large number of mass production lines established in a multitude of manufacturing and assembly facilities throughout the world. The assembly plant from which the finished automobile emerges is only the final element of a mass production operation that, for many companies, includes plants in several different countries. Into the final assembly plant flow large subassemblies such as the automobile chassis, the engine, major body components such as doors, panels, upholstered seats, and many electronic, electrical, and hydraulic systems such as brakes, lighting systems, and sound systems. Each of these, in turn, is usually the product of a mass production line in another factory. Stamping plants specialize in producing the formed metal parts that constitute the body of the automobile. Radio assembly plants, in turn, depend upon other assembly plants for components such as transistors and integrated circuits. There are glass plants for windows, transmission plants, tire plants, and many others, each specializing in the mass production of its own product, which is, in turn, fed into the final assembly plant. The control of the flow of material into and out of final assembly plants, including the scheduling of production from feeder plants and the timing of rail and truck shipments, is among the major engineering tasks that make the total mass production system for automobiles work.In the final assembly line one can see clearly how machinery and human effort in assembly are divided into many specialized skills. The special tooling and machinery developed to handle assembly parts and to aid operators in their tasks can also be observed. At a given point on the line a robot welder—unaided by a human operator—may weld body parts together. At another position the motor is mounted on the chassis by a large machine guided by an operator. In other places body panels and doors are assembled to the chassis, and dashboard instruments and wiring are added by hand with simple tools. Each operator learns his task in detail and uses tools specialized for that task. The total operation is paced by the speed of movement of the conveyor that carries the partially assembled automobiles. The number of operators, machine stations, and flow of materials to the conveyor have all been planned so that the conveyor can maintain an essentially constant speed with each operator and machine functioning near optimum effectiveness.In Ford's early lines, parts and product were precisely standardized. Only one car model was manufactured, and each unit was identical to every other unit in all aspects, including colour—black. Today's automotive manufacturing engineers have learned to mass produce a highly customized product. The same assembly line may turn out a variety of models with many colours and options. This is achieved by continued insistence on standardization of critical elements such as the methods by which parts are held together internally. Thus, the operator who specializes in assembling doors can handle a variety of models and colours equally well. In addition, the flow of materials to the various line positions is carefully scheduled and controlled so that the specific part required for a given model, colour, or option list arrives at the line at the precise moment that the partially assembled unit requiring the part has arrived along the conveyor. The exquisitely designed production-control systems operating in the automotive and other industries make it possible for the consumer to obtain a greatly enhanced variety of product without sacrificing the cost advantages of mass production techniques.Nonmanufacturing examples of mass productionThe mass production principles of the division and specialization of labour and the use of standardized parts and processes have been applied to a wide area of productive activity. In agriculture (agricultural technology) the development of specialized machines for plowing, seeding, cultivating, and harvesting followed by factories for preparing, preserving, and packaging food (food processing) products has drawn heavily on mass production principles. There are specialized manual tasks supplementing the specialized machines both in the fields and in the processing plants.In the service industries (service industry), such as air transportation, the division and specialization of skills can be observed among ticket agents, pilots, navigators, baggage handlers, flight attendants, maintenance crews, and traffic controllers. All major engineering projects in both design and manufacture generally require a complement of engineering specialties including chemical, mechanical, and electrical engineers and further subdivisions of these professions such as semiconductor engineers, circuit designers, and so forth.Thus, as industry becomes more complex at each level, the division of labour and specialization become necessary. At the same time, the need for coordination and communication between specialized members of the team becomes greater.Mass production and societyBoth the quantity and the variety of material goods in industrialized countries have resulted directly from the application of mass production principles. At the same time the environment and circumstances of those employed by, and associated with, the production of material goods have changed. The benefits that have arisen from the greatly improved productivity made possible by mass production techniques have been shared by employees, investors, and customers. The working environment has greatly changed, however. Similarly the complexities of management have increased substantially, and the investment requirements and risks faced by owners and investors have become much greater.Before the introduction of mass production techniques, goods were produced by highly skilled craftsmen who often prepared their basic raw materials, carried the product through each of the stages of manufacture, and ended with the finished product. Typically, the craftsman spent several years at apprenticeship learning each aspect of his trade; often he designed and made his own tools. He was identified with his product and his craft, enjoyed a close association with his customers, and had a clear understanding of his contribution and his position in society.In contrast, the division of labour, the specialization of narrow skills, the detailed engineering specification of how each task is to be carried out, and the assemblage of large numbers of employees in great manufacturing plants have greatly diluted the identification of employees with their productive functions and with their employers. Many surveys in the United States and in the industrialized countries of Europe have shown that workers do not fully understand and appreciate their roles and positions in society. In addition, the division and specialization of labour may lead to such narrowly defined skills and highly repetitive operations, paced by the steady progression of a machine or conveyor line, that tedium and fatigue arise to reduce the sense of satisfaction inherent in productive work.These physical and psychological factors have been the subject of numerous studies by industrial (industrial-organizational psychology) psychologists and others. Special attention has been paid to work factors which affect the psychological motivation that is a prime determinant of employee productivity. The psychological effects of the repetitive aspects of some mass production tasks have been examined in great detail. Tasks that are precisely paced by the rhythm of machine operation or conveyor-belt movement appear to be particularly fatiguing (fatigue). For this reason, efforts are made to structure each job so that the operator can vary his pace by working ahead of the conveyor for a period and then slowing down, and by interspersing work breaks with productive periods. Some individuals prefer tasks that are sufficiently repetitive and narrowly skilled that they do not require any substantial amount of mental concentration once the function is mastered. Most fatiguing are those repetitive tasks whose pace is out of the operator's control but which also require moderate mental concentration.With this understanding in mind, work tasks can be structured to produce a minimum of mental and physical fatigue; this planning is an important part of the design of a successful production operation.The highly repetitive, tightly paced production operations are usually the most easily automated. Thus, as technology advances, that part of the production operation that is most fatiguing, is least satisfying, and takes minimum advantage of the mental and physical flexibility of human effort is replaced by automatic machinery. Not only is productivity improved, but the remaining functions that require human effort can provide a more satisfying experience.There is also increasing study of the interaction of workers with the tools and machines that assist their efforts. Working together, engineers and physicians are making quantitative biomechanical studies of how the human body functions in performing physical tasks. These studies, which have led to the improved design of tools and work positions, are part of the broader field of human-factors engineering, which considers the abilities and limitations of people in productive functions and seeks out ways in which machines can be designed to provide the best allocation of function between human effort and machine assistance. These studies are especially important as automated manufacture becomes more common.The problem of the loss of employee identification with the job has been of special concern. Progressive industrial organizations work to strengthen this identification in many ways, such as by using job rotation and educational programs to diversify employees' experience and to acquaint them with various aspects of the manufacturing process. This can give each employee a concept of the total manufacturing task and the importance of each employee's specific function within that task. Employee suggestion systems provide further opportunity for the individual to have a direct effect on the productive process; the employee is given other opportunities to help structure the manner in which the job is performed. Thoughtful programs of this type can substantially ameliorate the feeling of anonymity that may otherwise result. Clearly employers must be willing to compromise on the division and specialization of work tasks that technical considerations alone might suggest as desirable. Job content and employee participation must be expanded so that the employee feels significant and retains motivation and identification.In addition to this increased attention to the structure of the job itself, increases in productivity and resulting increases in wages have reduced working hours and provided employees with opportunities and resources to develop interests outside the workplace. Forward-looking employers, aware of these needs, frequently support these activities through employees' clubs and other means.Economic effectsMass production, with its heavy dependence upon mechanized facilities and high levels of production volume, presents great challenges for industrial leadership. The importance of advanced planning and the coordinated control of the large human and capital resources associated with mass production have been described. The day-to-day problems of monitoring the status of a major manufacturing complex are also immense. Up-to-the-minute knowledge of status is essential to effective response when difficulties such as the breakdown of a machine, the shortage of required materials or components, or the absence of important employees occur. Many aids to management have been devised for collecting data, analyzing them, and presenting alternatives for management decision. The electronic computer, with its great capability for collecting, analyzing, and comparing data, is becoming especially important as a management aid, both in the initial planning and simulation of production facilities and in computer-based production and resource-control systems. In fact, the increasing use of mainframe and personal computers as business tools is rapidly making the management of mass production operations a quantitative technology in its own right.The need for substantial investment is another result of the application of mass production principles. Much of the increase in productivity that has been achieved by mass production is a direct result of the development and use of automatic machinery and processes to supplement human effort. This, in turn, requires the support of a sizable technical staff in advance of production and later substantial capital investment for production facilities. Increased levels of capital, which must often be committed years before production begins, and before the true market for the product can be established, greatly increase the risks that investors must assume and have markedly affected the investment climate in manufacturing industries.As capital needs have grown, the nature of ownership and investment in industry has changed dramatically. Economies of scale favour large, high-volume operations that require capital investment levels often well beyond the means of an individual owner. This has been the prime stimulant for corporate ownership of major manufacturing firms. Furthermore, the direct managers of the manufacturing enterprise seldom possess ownership control of the enterprise. This has created a new spectrum of relationships between the owners, the managers, and the employees of large manufacturing firms. Frequently the owners are principally concerned with the profits on their investments and leave the planning and managerial operations to professional managers.At the same time the large capital needs of growing industries place special emphasis on the ability to acquire the necessary capital resources. Thus, the financial markets become extremely important in determining the general directions in which manufacturing industry will grow. This emphasizes the importance of profit incentives to encourage private investment, which is vital to achieve the productivity advances possible in mass production operations.Similarly, industrial nations are strongly encouraged to retain and reinvest a significant fraction of their gross national product if national industries are to grow and to compete successfully in international markets. These problems of capital formation have been especially troublesome in introducing mass production in the developing nations.Other consequences of a mass production economy have become apparent. The increased consumption associated with low-cost production has created problems of conservation of natural resources and the disposal or reconversion of the wastes of production and of goods whose utility is ended. There are technological solutions for the resulting problems of solid wastes and air and water pollution, but the political and economic problems of how the costs will be distributed are difficult to solve.Morris Tanenbaum William K. HolsteinAdditional ReadingTwo handbooks contain a wealth of general information on industrial production systems, methods, problems, and management techniques: Gordon B. Carson, Harold A. Bolz, and Hewitt H. Young (eds.), Production Handbook, 3rd ed. (1972); and H.B. Maynard (ed.), Industrial Engineering Handbook, 3rd ed. (1971). See also Franklin G. Moore and Thomas E. Hendrick, Production/Operations Management, 8th ed. (1980), a classic textbook covering a wide range of topics in nontechnical language; and Harwood F. Merrill (ed.), Classics in Management, rev. ed. (1970), an excellent collection of excerpts from the writings of several pioneers in industrial production, including Frederick W. Taylor, Henri Fayol, and Frank B. and Lillian M. Gilbreth. Two general texts that cover many aspects of the general field treated in this article are Elwood S. Buffa, Modern Production/Operations Management, 7th ed. (1983); and Richard B. Chase and Nicholas Acquilano, Production and Operations Management: A Life Cycle Approach, 4th ed. (1985).Various aspects of systems and control are dealt with in B.H. Amstead, Phillip F. Ostwald, and Myron L. Begeman, Manufacturing Processes: SI Version, 7th ed. (1979); Michael Peters and Terence Oliva, Operations and Production Management (1981); and James H. Greene, Production and Inventory Control, rev. ed. (1974), and Operations Management: Productivity and Profit (1984).Early studies of the organization of human effort for production are treated in classics of the 18th and 19th centuries, including Academie des Sciences, Paris, Descriptions des arts et métiers, 45 vol. (1761–89); Adam Smith, An Inquiry into the Nature and Causes of the Wealth of Nations (1776, reissued 1981); and Charles Babbage, On the Economy of Machinery and Manufactures, 4th ed. enlarged (1835, reprinted 1971).Historical views of developments leading to modern mass production methods are J.K. Finch, Engineering and Western Civilization (1951), The Story of Engineering (1960); and Friedrich Klemm, A History of Western Technology (1959, reissued 1964; originally published in German, 1954). Technical descriptions of mass production techniques are given by E. Paul Degarmo, J. Temple Black, and Ronald A. Kohser, Materials and Processes in Manufacturing, 6th ed. (1984). The classical technical works on time and motion studies in manufacturing are Frederick Winslow Taylor, The Principles of Scientific Management (1911, reissued 1967); and Frank B. Gilbreth, Motion Study: A Method for Increasing the Efficiency of the Workman (1911, reprinted 1972). Ralph M. Barnes, Motion and Time Study, 7th ed. (1980), describes modern industrial engineering methods; Ernest J. McCormick, Human Factors in Engineering and Design, 5th ed. (1982), provides a broad study of the physiological aspects of engineering design. Trevor I. Williams, A Short History of Twentieth-Century Technology c. 1900–c. 1950 (1982), is a good overview; Otto Mayr and Robert C. Post (eds.), Yankee Enterprise: The Rise of the American System of Manufactures: A Symposium (1981), is a treatment of mass production revolution; Daniel Nelson, Frederick W. Taylor and the Rise of Scientific Management (1980), is a study of the development of Taylor's ideas; Ira C. Magaziner and Robert B. Reich, Minding America's Business: The Decline and Rise of the American Economy (1982, reissued 1983), is an account of specific problems.Books written about human and societal problems and adjustments to the industrial milieu include R. Burlingame, Backgrounds of Power: The Human Story of Mass Production (1949), a popular history and commentary; William A. Faunce, Problems of an Industrial Society, 2nd ed. (1981), on the sociological effects; and Harvey Swados, On the Line (1957, reissued 1978), about the problems of assembly line work. Others have focused on the problems of individuals and how they may be approached. Among these are William J. Dickson and F.J. Roethlisberger, Counseling in an Organization (1966); Robert N. Ford, Motivation Through the Work Itself (1969); Frederick Herzberg, Work and the Nature of Man (1966, reprinted 1973); and Charles R. Walker and Robert H. Guest, The Man on the Assembly Line (1952, reprinted 1979).
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