This article has multiple issues. Please help improve it or discuss these issues on the talk page . Knowledge workers are workers whose main capital is knowledge. Typical examples may include software engineers, doctors, architects, engineers, scientists, public accountants, lawyers, and teachers, because they "think for a living".
Another, more recent breakdown of knowledge work (author unknown) shows activity that ranges from tasks performed by individual knowledge workers to global social networks. This framework spans every class of knowledge work that is being or is likely to be undertaken. There are seven levels or scales of knowledge work, with references for each are cited.Knowledge work (e.g., writing, analyzing, advising) is performed by subject-matter specialists in all areas of an organization. Although knowledge work began with the origins of writing and counting, it was first identified as a category of work by Drucker (1973).Knowledge functions (e.g., capturing, organizing, and providing access to knowledge) are performed by technical staff, to support knowledge processes projects. Knowledge functions date from c. 450 BC, with the Library of Alexandria,[dubious – discuss] but their modern roots can be linked to the emergence of information management in the 1970s.Knowledge processes (preserving, sharing, integration) are performed by professional groups, as part of a knowledge management program. Knowledge processes have evolved in concert with general-purpose technologies, such as the printing press, mail delivery, the telegraph, telephone networks, and the Internet.Knowledge management programs link the generation of knowledge (e.g., from science, synthesis, or learning) with its use (e.g., policy analysis, reporting, program management) as well as facilitating organizational learning and adaptation in a knowledge organization. Knowledge management emerged as a discipline in the 1990s (Leonard, 1995)[full citation needed].Knowledge organizations transfer outputs (content, products, services, and solutions), in the form of knowledge services, to enable external use. The concept of knowledge organizations emerged in the 1990s.Knowledge services support other organizational services, yield sector outcomes, and result in benefits for citizens in the context of knowledge markets. Knowledge services emerged as a subject in the 2000s.Social media networks enable knowledge organizations to co-produce knowledge outputs by leveraging their internal capacity with massive social networks. Social networking emerged in the 2000s 
The hierarchy ranges from the effort of individual specialists, through technical activity, professional projects, and management programs, to organizational strategy, knowledge markets, and global-scale networking.