The phrase "adequacy of their" is correct and usable in written English.
It can be used when discussing the sufficiency or appropriateness of something belonging to a group or individuals.
Example: "The adequacy of their resources will determine the success of the project."
Alternatives: "sufficiency of their" or "suitability of their".
I cannot speak to the adequacy of their record keeping".
The police did not furnish comments about local drug activity or the adequacy of their recent patrols.
Worries persist about the adequacy of their capital cushions, especially with Greece's finances in such a mess.
For poorer Americans, any cut in promised pension benefits would sharply reduce the adequacy of their saving today.
He also ordered the suspension of all antiaircraft activities "until the adequacy of their technical parameters is checked out," the Interfax news service reported.
What has alarmed many is Section 404 of the Sarbanes-Oxley Act, which requires chief executives and chief financial officers to certify the adequacy of their internal controls.
"Unfortunately," says Preuss, "many neuroscientists are uncomfortable with open discussion of human specializations, for fear that the adequacy of their model animal will be called into question.
The danger for the firms in Mr. Cuomo's investigation of their outside links, however, is that it could turn the spotlight on the adequacy of their internal processes, too (and, most likely, those at the state pension funds as well).
Unable to afford a lawyer, the parents, Jeff and Sandee Winkelman, proceeded on their own to file a lawsuit challenging the adequacy of their son Jacob's program and seeking reimbursement for the tuition at the private school where they had enrolled him.
There is no controversy concerning the adequacy of their court oversight or privacy safeguards for intelligence surveillance.
Full-scale loading tests were performed on lining segments to confirm the adequacy of their design.
