The phrase "a valid aid" is correct and usable in written English.
It can be used when referring to a resource or tool that is legitimate and helpful in a particular context.
Example: "The new software serves as a valid aid for students struggling with math concepts."
Alternatives: "a legitimate resource" or "a useful tool".
Information and Communication Technology has recently been proposed as a valid aid to improve healthcare quality in chronic conditions.
We think that the scientific investigations on objects that have both an historical artistic and ethno anthropological value could supply a valid aid to a better comprehension of their usage and of their significance for the peoples [5], to date them in case of uncertain chronological attribution [6] and to have useful information to support the conservation work.
Some publications by scientific societies [ 5] have acknowledged the Ahlbäck classification as a valid aid for the selection of the surgical procedure.
"Therefore, it's important to use a valid diagnostic-decision aid like Larry's".
Calzaghe already had a St John Ambulance first aid course certificate, which was once a valid BBBoC approved first aid qualification, but the board insisted that he did their "three to four hour" course.
Critics insisted that the Marshall Plan was not a valid analogy for Third World aid because the former had been a case of helping industrial populations rebuild their societies, while the latter was a case of sparking industrial or even merely agricultural development in primitive economies.
A valid prediction score may also aid the clinician's ability to discuss patient prognosis at hospital discharge.
The ROSA is a valid and reliable instrument to aid medical practitioners in sensitively assessing AD-relevant symptoms over time in their clinical practice.
We suggest that a grounded understanding of the relationships between decision attributes will be beneficial in the development of a valid and relevant decision-making aid for CHC patients.
Whether Facebook is the right company to aid in this matter, however, is a valid question.
Now, at last, a valid alternative has arisen: the radical notion of letting aid recipients decide how to spend the money allocated to them.
