Manual labour (in British English, manual labor in American English) or manual work is physical work done by humans, in contrast to labour by machines and working animals. It is most literally work done with the hands (the word "manual" comes from the Latin word for hand) and, by figurative extension, it is work done with any of the muscles and bones of the body. For most of human prehistory and history, manual labour and its close cousin, animal labour, have been the primary ways that physical work has been accomplished. Mechanisation and automation, which reduce the need for human and animal labour in production, have existed for centuries, but it was only starting in the 18th and 19th centuries that they began to significantly expand and to change human culture. To be implemented, they require that sufficient technology exist and that its capital costs be justified by the amount of future wages that they will obviate. Semi-automation is an alternative to worker displacement that combines human labour, automation, and computerization to leverage the advantages of both man and machine.
Although nearly any work can potentially have skill and intelligence applied to it, many jobs that mostly comprise manual labour—such as fruit and vegetable picking, manual materials handling (for example, shelf stocking), manual digging, or manual assembly of parts—often may be done successfully (if not masterfully) by unskilled or semiskilled workers. Thus there is a partial but significant correlation between manual labour and unskilled or semiskilled workers. Based on economic and social conflict of interest, people may often distort that partial correlation into an exaggeration that equates manual labour with lack of skill; with lack of any potential to apply skill (to a task) or to develop skill (in a worker); and with low social class. Throughout human existence the latter has involved a spectrum of variants, from slavery (with stigmatisation of the slaves as "subhuman"), to caste or caste-like systems, to subtler forms of inequality.
Economic competition often results in businesses trying to buy labour at the lowest possible cost (for example, through offshoring or by employing foreign workers) or to obviate it entirely (through mechanisation and automation).
Formal learning scenarios, such as vocational classrooms, apprenticeships and academic studies, supply a theoretical approach to building skillsets. Learners acquire a systematic and procedural view of tasks, based on the specific parameters and needs of a job's intended outcome. The parameters are defined by the purpose of the job and the tools used to achieve it. Hair styling, for example, requires learners to gain competence in the methods of shaping, cutting, washing, dying, combing, and various other active manual skills, the proficiency of which will determine the final product. In such situations, the learner is guided and directed by educators in their technique and form, and learn to interpret a tool’s use in meeting the requirements of a task or project based on the expectation of the result.
Informal learning can be summarized as any activity which concerns the pursuit of understanding, knowledge, or skill that occurs without an imposed curriculum and explicit assessment. It typically manifests itself as practical engagement in the pursuit of knowledge. There are several ways which informal learning is conducted, that range from self-directed learning, observational learning, where there is intention to seek specific information outside of formal environments, to the coincidental learning that comes out of experiences. Informal training differs from informal training in that it focuses on the acquisition of a skill, understanding, or job-specific knowledge. The cognitive skills acquired outside of formal learning environment also help to define the mastery of what are considered "blue collar" jobs. The understanding of technique and method taken from formal training is expanded on in developing contextual application, situational awareness, and innovation based skills. Informal learning provides workers with opportunities of cognitive development unique to their field's context.That knowledge of context, derived from past experiences in comparable situations, dictates the use of one technique or plan over another. Plumbing, as an example, requires knowledge of piping and the mechanics of water systems, but also relies on details such as house age, the materials from which the specific plumbing system is made, how those materials react given different external changes or alterations, and a comprehension of hypothetical conditions and the resulting behavior of the problem and other related components when said conditions are brought into effect. These skills and understandings are inherent in both learning processes. As a whole, this type of knowledge is more learner-centered and situational in response to the interests or needed application of the skill to a particular workforce.
Mechanisation and automation strive to reduce the amount of manual labour required for production. The motives for this reduction of effort may be to remove drudgery from people's lives; to lower the unit cost of production; or, as mechanisation evolves into automation, to bring greater flexibility (easier redesign, lower lead time) to production. Mechanisation occurred first in tasks that required either little dexterity or at least a narrow repertoire of dextrous movements, such as providing motive force or tractive force (locomotives; traction engines; marine steam engines; early cars, trucks, and tractors); digging, loading, and unloading bulk materials (steam shovels, early loaders); or weaving uncomplicated cloth (early looms). For example, Henry Ford described his efforts to mechanise agricultural tasks such as tillage as relieving drudgery by transferring physical burdens from human and animal bodies to iron and steel machinery. Automation helps to bring mechanisation to more complicated tasks that require finer dexterity, decision making based on visual input, and a wider variety of intelligent movements. Thus even tasks that once could not be successfully mechanised, such as shelf stocking or many kinds of fruit and vegetable picking, tend to undergo process redesign (either formal or informal) leading to ever smaller amounts of manual labour.
Many of the methods by which socioeconomically advantaged people have maintained a supply of cheap labour over the centuries are now either defunct or greatly curtailed. These include peasantry, serfdom, slavery, indentured servitude, wage slavery, and domestic servitude. But motives to get labour cheaply still remain. Today, although businesses can no longer get away with using de jure slavery, economic competition ensures that they will typically try to buy labour at the lowest possible cost or to reduce the need for it through mechanisation and automation. Various present-day methods of ensuring low labour costs are detailed below.
The first and most basic method is the domestic labour market within one country (or region thereof), in which workers compete with each other for jobs. Within this market, further market segmentation is possible. Businesses try to avoid overtime (when practical). They often try to avoid employing full-time employees (FTEs) in favor of part-time employees (PTEs) or contingent workers (for example, temporary workers, freelancers, cottage workers, contractors (who may have subcontractors), or day labourers), all of which usually entail less obligation for employee benefits (compensation beyond the wages themselves). Agencies tasked with enforcing labour law are supposed to be perennially on guard against the avidity with which employers find clever ways to make people function like FTEs but carry nominal labels as contractors, freelancers, or PTEs (e.g., dishonest worker classification, unpaid overtime). Other avenues of discount labour are the institutions of apprenticeship and cooperative education (including work-study programs), and (relatedly) the informal tradition of the "broke college student who works for peanuts". Here, the low wages are often credibly justified by the inexperience and incomplete training of the worker.
The domestic labour market may also extend beyond "normal" workers to various kinds of employing prisoners (e.g., penal labour, work release). Even military employment, most especially by conscription or other mandatory national service, is a means of employing labour at lowest cost (compared to costlier alternatives such as all-volunteer militaries).
The next step beyond domestic labour markets (within countries) is the global labour market (between countries), in which all workers on Earth compete with each other, albeit via imperfect competition. Differences between regions and countries in standard of living and (relatedly) prevailing wage rates provide a perennial incentive for businesses to send manual tasks to remote workers (via offshoring) or to bring remote workers to the manual tasks (via immigration of foreign workers, whether illegal [undocumented workers] or legal [guest-worker programs codified with work permits). The nature of the work determines its relative degree of geographical transferability; for example, manual assembly work in factories can usually be offshored, whereas tillage and harvesting are anchored to the location of the crop fields. One characteristic of offshoring and worker migration that is especially useful to businesses is that they can provide employers with (fuzzy-boundaried) subpopulations of inexpensive workers without resorting to biological-inheritance-based rationalisations (such as racial slavery, feudalism and aristocracy, or caste-based division of labour).
Penal labour is an intersection of the low skill/low social class idea (serfs, slaves, wage slaves) and the class-neutral labour-cost reduction idea (offshoring, foreign workers, contingent workers). Like offshoring and guest worker programs, penal labour is an opportunity for businesses to get cheap manual labour without denying the humanity of the workers—and in some cases even seeming civically responsible ("providing second chances to live right and work honestly"). Thus socioeconomic systems, regardless of their capitalist, socialist, or syncretised ideological bases, need to remain vigilant that they resist any tendency toward the overimprisonment of workers, because it could align with the financial interests of businesses, government, or both, stoking the same human mechanisms of specious rationalisation that justified slavery or wage slavery.
Military enlistment (whether conscription, other mandatory service, or volunteer service) shares some similarities with penal labour when viewed from this perspective, in that it may synergistically provide (1) discount labour for a government or its contractors at the same time that it also provides (2) opportunities to the workers or soldiers themselves (for example, more job security, better-quality health insurance, better-quality retirement-savings plans, and/or more educational opportunities [most especially technical training, but sometimes also broader university education as well]). These many benefits cannot accurately be pigeon-holed as all good or all bad. They are inevitably double-edged blades, and must be dynamically managed and monitored to keep them from leaving the healthy range of the spectrum and moving into pathological ranges. For that to succeed, there must also exist some decent level of employment opportunity, compensation, and psychological security in the private sector, especially non–defense community businesses.
Paramilitary, police, and corrections (prison guard) service are other segments of employment that reflect the traits of military service in this respect.