The phrase "questioning the effectiveness" is correct and usable in written English.
You can use it when discussing the need to evaluate the efficacy of someone or something. For example, "The committee is currently questioning the effectiveness of the new policy."
A recent RCT in subjects with an MRI-verified meniscal tear compared meniscectomy and exercise with exercise alone and found no superior effect of meniscectomy, further questioning the effectiveness of meniscectomy in middle-aged people [ 49].
During the last year or so, advertisers have been questioning the effectiveness of their Internet advertising, especially banner ads.
In recent years, there have been escalating concerns about employers monitoring workers, with critics questioning the effectiveness of this technology.
Last week, The Journal of the American Medical Association published a study questioning the effectiveness of antidepressant drugs.
There is an article questioning the effectiveness of a new vaccine that purports to curb cocaine cravings.
The courts allowed the NMT medical conglomerate to sue the Shrewsbury physician Peter Wilmshurst for doing his scientific duty and questioning the effectiveness of its heart treatments.
Policy makers and pundits are also questioning the cost effectiveness of end of life care--starkly stated in the grisly title of an article in Newsweek: "The Case for Killing Granny".
Furthermore, with recent studies questioning the cost-effectiveness of telehealth [ 24], it becomes even more salient to unravel such underlying issues.
Further, they cited research questioning the program's effectiveness.
In 2002, the treasury inspector general issued a report questioning the office's effectiveness in the war on terror.
On this particular day, in May 2015, the circle charged with overseeing holacracy's adoption was questioning the method's effectiveness.
