The phrase "valid suggestion" is correct and usable in written English.
You can use it to refer to an idea that is worth considering. For example, "I have a valid suggestion about how to improve the process."
Jakki Moxham Chief executive, Housing for Women London SW9 At last, a valid suggestion for a modern school curriculum.
(And, no, the Austrian School/Andrew Mellon solution of "liquidate, liquidate, liquidate" doesn't count as a valid suggestion).
An important contribution of this case study is that it documents the process of game conceptualization and makes a reasoned and valid suggestion for how educational games may be developed and evaluated.
The worker made a valid suggestion on a project.
Regardless of your feelings of Oprah, this is a very valid suggestion.
To maintain that balance, you have to carefully weigh the feedback you get and sometimes eschew seemingly valid suggestions.
Although these recommendation bring valid suggestions, they rely only on the folksonomy as the source of information for creating semantics, leaving out contextual information provided by the Web resource itself.
While these are valid suggestions, coupling education with taxation can bring quicker change and also finance reform campaigns as well as the health care costs of obesity already borne by Medicare and Medicaid.
Be open to valid suggestions for improvement.
Do incorporate valid suggestions, if possible.
And every so often someone will point out an error in the vast list of recommendations on the blog (a collection of all the valid title suggestions I've received since the project began).
