The following is an abridged version of what Teh Hooi Ling wrote on her "show me the money" column. I have read her earlier article on the use of the Piotroski F-score and I think that beginners who can try to come up with such a scoring matrix, will make a positive step in improving their investing process.
Most of the companies that she has listed out as a result of using the F-score, are all very big companies. This will end up neglecting to include small cap stocks that have the potential for supernormal returns, volatility notwithstanding. That said, it is possible while during portfolio construction to use a separate screen altogether when allocating money for small caps. To be sure, Teh has written on how to select small cap stocks before.
In search of good long candidates (Link here)