The direction of a correlation is either positive or negative. In a negative correlation, the variables move in inverse, or opposite, directions. In other words, as one variable increases, the other variable decreases. For example, there is a negative correlation between self-esteem and depression. In other words, the higher your self-esteem, the lower your feelings of depression.
Excel Communications was founded in 1988 by Dallas entrepreneur Kenny Troutt as a long distance reseller in the US telecom sector at the birth of telecom deregulation.
SAP is actually the name of a company that was founded in Germany in 1972. SAP was originally created by five former IBM engineer employees. This system helps companies manage cost accounting, assets and production operations. At the same time, it also helps with archived documents, personnel and materials.