The phrase "a decisive contribution to" is correct and usable in written English.
It can be used when discussing the significant impact or influence of something on a particular outcome or situation.
Example: "Her research made a decisive contribution to the understanding of climate change."
Alternatives: "a significant impact on" or "a crucial role in".
Michael Offer, a spokesman for Germany's Finance Ministry, described the decision as a "decisive contribution" to help resolve global imbalances.
This work, in turn, made a decisive contribution to the development of Tang romantic fiction.
They make a decisive contribution to the success of the most popular sporting event.
It has put the UK in a position to make a decisive contribution to the global effort.
They do not perceive the abyss between such peripheral interventions and a decisive contribution to regional and international security.
We expect above all the Muslim population of Russia to make a decisive contribution to this fight".
German Chancellor Angela Merkel signaled at the start of the ASEM summit that she expected Putin to show convincing steps toward making the Sept. 5 cease-fire "a reality". "Russia must make the decisive contribution to de-escalation," Merkel told lawmakers in Berlin before setting off for her Thursday night meeting with Putin on the sidelines of the Milan summit.
This year's Nobel Peace Prize has been awarded to the Tunisian National Dialogue Quartet "for its decisive contribution to the building of a pluralistic democracy in Tunisia".
The Nobel Committee cited the quartet for its "decisive contribution to the building of a pluralistic democracy in Tunisia in the wake of the Jasmine Revolution of 2011".
The Norwegian Nobel Committee cited the Tunisian National Dialogue Quartet "for its decisive contribution to the building of a pluralistic democracy" in the North African country following its 2011 revolution.
