The Regional category contains English language sites about geographical regions of the world. See the Regional Guidelines for detailed editor notes on how to organize a particular Regional category.

Business consultants are individuals or firms with expertise in business procedures, practices and policy. Organizations of all types use consultants, and these consultants examine these organizations from a broad operational perspective applying a variety of skills to achieve a specific outcome, solution, or result. Through analysis and study, consultants provide problem resolution and prevention solutions related to business operations, infrastructure, and performance. Consultants have many roles, varying from a supportive one within an existing team, to providing temporary leadership over an identified problem area, to other independent activities conducted at the request of the organization. This category has been divided into three areas to reflect the many functions and roles within the business consulting profession. The top level is divided by some of the various specialty or focus areas typical to the business consulting industry (e.g., business formation, financial, management, manufacturing, outsourcing, etc.). The second level contains a variety of industry specific subcategories (e.g., construction, energy, engineering, science and industry, security, etc.). Within the lowest level is a list of closely related "See also" categories that may contain other types of consultants. Before you submit your site please take the time to look around the category to ensure that your site is appropriate to this category. Also, be sure to review the general guidelines for the Business categories. The editors reserve the right not to list your site, and to delete it after its addition. Multiple submissions may be considered when appropriate (for example, a site that contains valuable resources pertinent to multiple subcategories) but repeated submissions, especially to inappropriate categories, will not be tolerated. Please, submit only to those categories most appropriate to the content of your site.

Artificial Intelligence is a field of science that has several goals. The first, often called "weak" AI, is the effort to design and implement computer systems that can perform tasks requiring intelligence when performed by humans. AI in computer games, knowledge based systems and such are typical examples of this branch. The second, less tangible branch, often called "strong" AI, is the research that ultimatly aims to build artificial systems that display real intelligence. It does this by trying to understand or model the nature of human intelligence. Both branches are multidisciplinary, in that they have close relations with the fields of computer science, philosophy, medicine, psychology, biology and linguistics.

Robotics is a term coined by Isaac Asimov to describe the field of science involving robots and related technologies. So what is a robot? The word comes from a 1923 Czech play called R.U.R. and described autonomous, humanoid robot servants. The original Czech word was robota, which means "servitude or forced labor". According to the Syrius Cybernetics Corporation of Douglas Adams' Hitchiker's Guide to the Galaxy, a robot is "your plastic pal who's fun to be with". A more conventional definition is, "A mechanical device that sometimes resembles a human and is capable of performing a variety of often complex human tasks". There are many other definitions, some a bit too narrow and some far too broad. We try to be as inclusive as possible, accepting sites about hobby robotics, industrial robotics, even those about the radio-controlled entertainment vehicles of "Robot Wars". Enjoy our selections. And if you don't agree with some of our choices, rest easy in the knowledge that someone else out there wouldn't agree with yours.

This category deals with all things pertaining to the technology, theory, and science of aeronautics. Here you will find sites that describe the technical aspects of flying, aviation and aeronautics.

Cognitive science topics which may span one or more specific sciences including psychology and medicine. Sites, works and indices that assume a scientific model in their processes, references or information gathering and summary.

Known by other scientists as the "Dismal Science," this field makes a serious effort to study and describe:

The production, distribution, exchange, and consumption of wealth and the various related issues (problems) of labor, finance, taxation, currencies, the political arena as it relates to the above areas of goods and services.

Although interest in economic theories dates to the origins of commerce itself, economics as a modern study independent of moral or political philosophy is attributed to the Scottish writer Adam Smith (1723-1790). The ideas put forth in his seminal work, Wealth of Nations, form the basis of "classical" economic theory and free-market capitalism.

Math or mathematics is the study of numbers and variables representing numbers to solve everyday problems, learn about the world around us or to be an exercise in logical reasoning.

Some applications of math are in the areas of finance, physics, sociology, computer programming, fractal music and geometric art.

Open to English-language sites relating to Linguistics, the study of human languages.