The first industrial revolution used water and steam to mechanize production and move work from handcrafts to factories. The second added electricity, new materials and the assembly line for mass production. The third industrial revolution brought electronics and computers to automate processes. The fourth connects machines with sensors, data, AI and cloud systems to build smart factories. Industry 4.0 is closely associated with the smart factory, as of November 2026. A smart factory is a manufacturing environment with advanced sensors, embedded software, robotics and connected systems; it uses big data collected by Internet of Things sensors, and enterprise resource planning software takes in this data. Industry 4.0 makes predictive maintenance possible. Internet of Things sensors can identify potential maintenance issues in real time; that lets machine owners perform cost-effective maintenance before the machinery fails.

A supply chain is a complex logistics system of facilities that convert raw materials into finished products and distribute them to customers. Supply chain management focuses on optimizing the flow of goods within it; it is actually a complex and dynamic supply and demand network, not a simple straight chain. Suppliers in a supply chain are often organized in tiers. First-tier suppliers, also called direct suppliers, supply goods or services directly to the client. Second-tier suppliers supply the first tier, and so on, creating a hierarchical structure within the supply network. Toyota says a car is made up of more than 30,000 parts. These parts are made not only by Toyota but also at the plants of many of its business partners. All the plants must work with complete synchronization to make vehicles quickly and without waste. The Toyota Production System rests on two pillars. The first is jidoka, loosely automation with a human touch; it means stopping immediately when abnormalities are detected. So that defective products are not made and people do not need to simply watch over machines.

The second pillar is Just-in-Time. It means synchronizing production processes and linking all plants in a continuous flow, by making only what is needed, when it is needed, and in the amount needed. The world's factories held a record 5 million operating industrial robots in 2025, up 9 percent, and installed more than 600,000 new ones that year, as of September 2026, according to the International Federation of Robotics. In 2025 China installed 354,000 industrial robots, almost 60,000 more than its previous annual record, as of September 2026. Chinese manufacturers sold 195,000 of them at home, a 55 percent domestic market share. In 2025 the United States passed Japan to become the second largest market for industrial robots. In 2024 the Republic of Korea had the world's highest robot density, 1,220 industrial robots per 10,000 employees, as of November 2026. Its electronics and automotive industries are the two largest customers for industrial robots.

Amazon has built and deployed more than 1 million robots in its operations since buying Kiva Systems in 2012, as of November 2026. It says the goal is to pair workers with technology that makes their day easier and more productive. Amazon says its Sequoia system enables it to identify and store inventory up to 75 percent faster at fulfillment centers, as of November 2026. Mobile robots transport inventory directly to a containerized storage system or to an employee picking out items for a customer order. In the United States, manufacturing added about $3.00 trillion to the economy, 9.4 percent of GDP in the second quarter of 2026. It employed about 12.6 million people at more than 239,000 manufacturers, as of November 2026. About 74 percent of US manufacturing firms have fewer than 20 employees, as of 2026. The National Association of Manufacturers says US manufacturing accounted for 52 percent, as of November 2026, of all private-sector research and development in the US.

Arkwright's achievement at Cromford was to combine power, machinery, semi-skilled labor and the new raw material of cotton to create mass-produced yarn. His organizational skills earned him the title father of the modern industrial factory system. Interchangeable parts, mass production, the moving assembly line, lean thinking and now sensors and robots each changed what a factory is. Ford's moving assembly line cut the time to build a Model T from 728 minutes, about 12 hours, to 93 minutes. Assembly-line ideas are older than Ford, though: the Portsmouth Block Mills, Chicago meatpacking and Ransom Olds in 1901 came first. And the Model T was not available in black in its first years: from 1908 to 1913 it came only in gray, green, blue and red.

Words to know

• tiers: levels
• predictive: forecasting
• synchronization: timing together
• logistics: moving goods