1.   But these momentum strategies, which have been widely known for decades and have gained in popularity, have shown staying power.

2.   Earnings momentum strategies have been losing steam, though it is too early to count them out.

3.   However, CANSLIM, the second-best performing model, is the original and still probably the most widely followed momentum strategy.

4.   In another hypothesis, earnings momentum strategies simply do not work in economic downturns.

5.   Indeed, momentum strategies look more effective than ever.

6.   Momentum strategies work best in strong markets, hardly the case in recent months.

7.   Part of the explanation lies in the short-term momentum strategies that almost all the sector-rotation newsletters pursue.

8.   Twentieth Century Ultra uses an earnings momentum strategy that often requires the fund to trade quickly in response to earnings disappointments or rejiggered forecasts.