"effective purpose" is correct and usable in written English.
You could use it when referring to a goal or plan that is specific and achievable. For example, "The committee set an effective purpose of increasing awareness of the charity's work."
The Second International lingered for a time, but to no effective purpose.
If "modernism" had any effective purpose beyond acclimating cultivated people to rapid worldly change, it was a bust.
One wonders if Nato is the right organisation for running an assistance operation like Isaf – particularly as well under a third of the alliance nations are prepared to employ arms to any effective purpose in the mission.
"The cost of our system of capital punishment is so enormous that any benefit that could be obtained from it — and I now think there's very little or zero benefit — is so dollar-wasteful that it serves no effective purpose," Donald Heller, the drafter of the 1978 measure, said recently.
A colleague recently told me he had spent a month researching the literature of his child's condition (to critically effective purpose) and we agreed he could only do this because he was a professor at a University.
"There are now some good examples of where people have put their money to very effective purposes, but they have had to work hard on the professionalization and the institutionalization of their philanthropic arms," Mr. Sinha said.
"There is no uplighting," Bébé notes - "no light pollution and, therefore, no glare" into the beautifully starlit skies, but soft pools of gentle light that are used around your house for more effective purposes.
Subsequent failure cases are designed to have the charity's funds applied to more effective purposes, and as such money already donated to the charity cannot be returned to the next of kin of the original money; in Re Wright, it was said that "once money has been effectually dedicated to charity... the testator's next of kin or residuary legatees are for ever excluded".
Therefore, a guide plate is was designed and installed on a cubic frame reef for a cost-effective purpose.
The more its qualities are understood and respected, the better it can be guided to an effective theatrical purpose.
For this problem extensive research has resulted in effective general purpose methods.
