A business intelligence system is designed to provide ongoing information about events and trends in the technological, economic, political, legal, demographic, cultural, social, and competitive arenas for the manager. The information is gathered from many sources.
Information Sources are categorized into 3 levels:
1. Primary sources
Primary sources are raw data without interpretation that represents an official opinion. Examples of primary sources are memos, letters, interviews, laws, regulations, census, etc.
2. Secondary sources
Secondary sources are interpretations of primary data. Examples of secondary data are encyclopedias, textbooks, handbooks, magazine articles, newspaper articles, etc.
3. Tertiary sources
Tertiary sources may be interpretations of a secondary source, but generally represented by indexes, bibliographies, and other finding tools such as Internet search engines.