The phrase "acknowledge the effectiveness" is correct and can be used in written English.
You can use it to acknowledge or recognize that something has been effective or successful. Example: The results of the study clearly acknowledge the effectiveness of the new treatment method in reducing symptoms of the disease.
Pakistan's Parliament has repeatedly demanded an end to drone strikes, but Pakistani officials privately acknowledge the effectiveness of such attacks.
If liberalism's day has passed, we ought to give a bit of credit where credit is due, and acknowledge the effectiveness of Midge Decter's mouth.
From this, he somehow arrives at the claim that liberals who refuse to acknowledge the effectiveness of the surge in Iraq lack moral courage.
The government of South Africa's unwillingness to acknowledge the effectiveness of ART and outright questioning of the relationship between HIV and AIDS has been extensively reported [ 18].
This means that they do not only have to recognize (and possibly ignore) that a declaration has been made but they also have to acknowledge the effectiveness and legitimacy of this declaration.
Pakistani officials publicly denounce American drone strikes but have privately acknowledged the effectiveness of the campaign.
Democrats and Republicans alike acknowledged the effectiveness of labor's political efforts.
Steve Bannon, speaking on a Breitbart radio program after Jones defeated Roy Moore, whom Bannon repeatedly stumped for, acknowledged the effectiveness of the collective progressive ground game.
Mr. Netanyahu, who acknowledges the effectiveness of the Palestinian security forces, could allow these forces to develop advanced counterterrorism capacities, which they do not now possess.
ISLAMABAD, Pakistan — In an unusual briefing, a top Pakistani general leading troops in the volatile North Waziristan region has acknowledged the effectiveness of the American drone strikes against foreign militants, according to reports in the local media.
"I think when it became apparent that the budget was not going to use the Rainy Day Fund in the Senate, that was probably the high-water mark of acknowledging the effectiveness of the outside groups," said Arlene Wohlgemuth, director of the policy foundation and a former legislator known for her feisty conservatism.
