The first industrial revolution began in the 18th century through mechanization and the use of steam power for industrial purposes, which was one the greatest breakthroughs of the time.
The second industrial revolution began in the 19th century through the discovery of electricity and the assembly line production. Henry Ford carried over these principles thereby setting a new standard.
The third industrial revolution began in the 1970s through partial automation, memory-programmable controls and computers. These technologies allowed to further automate production.
Industry 3.5 began in the early 1990s through integration, advanced process controls and data analysis. This decision making ability paved the way for the fourth industrial revolution.
The fourth industrial revolution began in the early 2000s through the offshoring of production, which allowed for the digitalization of processes ensuring production which is nearly autonomous.
The fifth industrial revolution is a vision of industry beyond productivity. One where machine learning and artificial intelligence enable users to get the most out of consumer experience.