Small-cap index investing works, just don't do it with the Russell 2000.
Quality and value investment strategies often introduce ancillary sector bets, but it is probably prudent to constrain them.
This strategy aggressively pursues value and momentum stocks, while attempting to cut downside risk.
Bad performance tends to cluster.
There are other variables at work.
A recent Morningstar study found that high-conviction managers haven't outperformed their better-diversified counterparts.