In view of its effectiveness, it seems more sensible to work with a lower rotational speed.
A study of its effectiveness concluded that it appears to be successful, although it hasn't been running long enough to draw any concrete conclusions.
For some, it was close to magic in terms of its effectiveness, while others described it as useless.
"It's more than just the ad, it's the measurement of its effectiveness," said Foursquare's Tristan Walker.
This is not the unraveling of Obama's Middle East policy; on the contrary, it's the demonstration of its effectiveness.
In theory, a probiotic could potentially have an effect of the microbiome of the vagina, though proof of its effectiveness hasn't really been established".
Conclusive evidence of its effectiveness has proved hard to establish.
This is the surest sign of its effectiveness.
Critique the campaign in terms of its effectiveness in reaching young people.
It exemplifies what's best in "Selma" while also revealing the limits of its effectiveness.
So I was glad to read the news about the uncertainty of its effectiveness.
