"demonstrable result" is correct and usable in written English.
You can use it when referring to an easily understood, clearly shown result that can be demonstrated in some way. For example, after months of dedicated study, the student was rewarded with a demonstrable result - a stellar grade on her final exam.
Over the last decade, District 2's emphasis on teacher development has had demonstrable results.
Rapidly demonstrable results become the way to ensure that valuable work continues.
The practice has been creeping into basketball front offices for several years, although with far less attention or demonstrable results.
The second level of the health care debate that Mr. Callahan sketched was "ideological": government versus market as a matter of principle, not demonstrable results.
But according to the state evaluators, the pleasant atmosphere and high levels of parent and student satisfaction are no substitute for demonstrable results.
Chandler, 29, has long been a defensive force inside, bringing grit and hustle to every team he joins, with demonstrable results.
Teachers will now find it more difficult to get tenure, as well they should; instead of coming after three years in the classroom it will now take at least five, and it will take demonstrable results too.
My investigations into West Midlands police's excessive and inappropriate use of section 60 searches - a highly intrusive power whereby the constable does not have to have a "reasonable suspicion" to justify the stop - got demonstrable results: from 2004 to 2007, the use of this power reduced dramatically.
While some level of diplomatic intervention is possible, experts say that the United States and other nations that are closely watching the situation may also be experiencing a level of "Haiti fatigue" after the military and financial resources that have been poured into this impoverished nation without many demonstrable results.
The application of a Multiobjective Genetic Algorithm (MOGA) leads to demonstrable results.
