Дополнен 14 лет назад
например вот это...
Two sources of data are available: secondary and primary. Secondary data are information that has already been gathered for some other purpose. It may be internal (within the company) or external (outside the company). A company’s own sales records and accounts are excellent sources of internal secondary data. They are usually easy to obtain, and they can be extremely useful. Government census figures provide external secondary data. In some countries there are commercial sources of information, too. A disadvantage of secondary data is that they may not be relevant. They tell only what happened in the past, and they may be out of data. Secondary research can indicate sales trends in a product category. It can tell how many people have bought a product. But it cannot explain why they bought it. And consumer motivation is an increasingly important consideration in advertising.
кто способен это перевести САМ...?