How GreatSummary Works: 

1. User pastes a text source or URL and identifies the number of sentences to be returned.
2. The system identifies the sentences in the text
3. Using a mathematical technique called singular value decomposition, the system identifies the words that capture the key threads of the text.  The process is repeated until the number of sentences requested by the user is reached.
4. GreatSummary then ranks the sentences according to these words. 
5. The results are returned to the user.