Warren Buffett wrote the preface for Graham’s book – The Intelligent Investor – in which he calls it “by far the best book about investing ever written.”

Graham’s first recommended strategy – for novice investors – was to invest in Index stocks.
For more serious investors, Graham recommended three different categories of stocks – Defensive, Enterprising and NCAV – and 17 qualitative and quantitative rules for identifying them.
For professional investors, Graham described various special situations or “workouts”.

The first requires almost no analysis, and is easily accomplished today with a good S&P500 Index fund.
The last requires more than the average level of ability and experience. Such stocks are also not amenable to impartial algorithmic analysis, and require a case-specific approach.

But Defensive, Enterprising and NCAV stocks can be reliably detected by today’s data-mining software, and offer a great avenue for accurate automated analysis and profitable investment.