The phrase "a useful purpose for" is correct and usable in written English.
It can be used when discussing the function or benefit of something in a specific context.
Example: "The new software was designed with a useful purpose for improving team collaboration and communication."
Alternatives: "a beneficial use for" or "a practical application for".
If that is what Ms. Washington-Williams intended, she has served a useful purpose for us all.
Despite her pointed rhetoric – warning any country who voted against the US that she was "taking names" – she succeeded in convincing Trump that the UN served a useful purpose for US national interests.
This type of complaint serves a useful purpose, for it helps us to reconnect to our mission statement and allows us to respond through stories not soundbites, lectures, or sermons to reveal real, ordinary people in all of their complexities.
Even as adversaries, they serve a useful purpose for each other.
He said South Ossetia served a useful purpose for Russia, by destabilizing the Georgian economy and Mr. Saakashvili's government.
The repeated performances clearly serve a useful purpose for a public demanding justice in the wake of a seemingly endless stream of corporate scandals.
Such religious displays would actually serve a useful purpose if seen for what they are: not affirmations of righteousness but testaments to hypocrisy.
Add-on testing can theoretically serve a useful purpose in allowing for thoughtful ordering of additional testing based on initial laboratory test results or other clinical data.
But he adds that the report serves a useful purpose by pushing for conflict-of-interest data at earlier stages in the selection process.
"My father always said that if you follow the need, you'll never lack for a useful purpose". You also won't lack for humility and perspective--because what you are trying to accomplish will always be bigger than you are.
Abroad, especially in the tropics, where collecting butterflies could still have a useful purpose – discovering new species, for instance – another factor comes into play: the sense of butterflies as national property.
