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An application field is a broad collection of related topics and specialized activities that form the basis of a related set of jobs or processes. Typically, an application field includes a wide range of related activities, from systems design and machine control to business analysis and complex problem solving. The working principle underlying an application field is based on a combination of established principles and practices, coupled with innovative applications of technology, to create a powerful and evolving tool for a variety of tasks.

A principal sub-category of application fields is the field of computer science. The scope of this field encompasses a broad spectrum of activities, from low-level language programming (e.g. assembly language programming, debugging, etc.) to sophisticated distributed computing (e.g. grid computing, cluster computing, peer-to-peer systems, etc.) and many other related disciplines. Computer scientists design, create, debug, deploy and maintain computer software and hardware systems, and they are also skilled in detecting and resolving flaws and errors in software and hardware programs.

Another broad application field is the field of engineering. Engineer\'s use mathematics, science and principles of logic to solve practical problems and design and develop related products and services. Examples of engineering application fields include civil engineering, mechanical engineering, electrical engineering, chemical engineering, aerospace engineering and nuclear engineering. Other areas such as Construction engineering and software engineering can also be included. Depending on the specific branch of engineering, different disciplines may be involved, including civil engineering, mechanical engineering, electrical engineering, chemical engineering, aerospace engineering, computer engineering, and more.

Business and economics are application fields that encompass the structure and management of businesses, the development of economic policies, and the analysis and interpretation of market forces. Also included in this field are the study of business organizations, the economics of information, and the social implications of business. Business and economics are increasingly becoming interrelated with advancements in technology, as business and economic principles often have implications with regards to the implementation of technology.

The study of history and the humanities is another application field, which focuses on the past. Additionally, the humanities field examines various subject-matters of culture, such as language, religion, philosophy, literature, music, dance, art, and architecture. For example, the study of history encompasses such topics as the objectives and consequences of military engagements, the development of legal and political systems, the role of social institutions, and the evolution of communication.

Finance and accounting are important application fields pertaining to the functioning of organizations, governments, and financial institutions. Generally, accounting focuses on the recording, measurement and reporting of financial transactions. Accounting principles also include the recognition and evaluation of assets, liabilities, and income sources. Finance, on the other hand, deals with the management of money, investments, and the realization of profits or losses through the use of financial instruments.

Finally, the fields of communication studies and sociology are application fields in the social sciences that include the study of human interaction, the conduct of research and analysis, and the application of communication theories and techniques to organizations and individuals.

In conclusion, application fields are collections of related topics and activities that comprise an area of expertise or profession. There are various application fields, which vary in their scope and complexity, ranging from engineering and computer science to history and the humanities. Each application field has its own working principles and practice, and the successful application of these principles requires knowledge and experience.