Earlier, organizations need to analyze the impact of external factors on the basis of performance. They used old statistical modelling tools and took months of data collection and analysis and guessed the external factor which had more impact on the business. These models became outdated as soon as they were developed as external data were constantly changing. During the economic crisis, companies did not understand the economy. But, nowadays, as consumer behavior and other useful data sets have become more available, businesses can address challenges and opportunities by improving bottom line profits and helps to generate higher revenue by following correlation of real time data model.  For more read the article written by Rich Wagner (President and CEO of Prevedere) at : http://www.informationweek.com/big-data/transforming-an-antiquated-business-intelligence-process-/a/d-id/1324197