Quote from TheGoonior:
Also, I'd be willing to bet the amount of research he puts into each of his purchases is rather substantial, as opposed to your average investor who buys Coca-Cola because they had a Mountain Dew for lunch.
Anybody who wants to know about Buffett's investment strategies should read 'Buffettology' and 'The New Buffettology' by Mary Buffett. It gives a detailed explanation of his research techniques and what he looks for in companies' financials and fundamentals. These books have been the most clear and precise of any books written on Buffett.