How many people wrote the Torah?

Just read an article on software that helps determine how many writing styles and where they are used for Hebrew texts...

Can computers solve mystery of bible’s ‘ghostwriters’

"...Now researchers at Tel Aviv University have developed an algorithm that they claim can delineate between the different contributors within individual books of the Bible. The program does this by detecting noted differences in writing styles and dividing the texts into probable author groupings. Its designed to distinguish between certain linguistic patterns, such as word preferences...."

I would love to see this run on the book of Psalms... It might be good to write a greek version to add to the debate on if Paul wrote Hebrews... I love it when science and the Bible get together... :)