The phrase "a decisive plan to" is correct and usable in written English.
It can be used when discussing a clear and determined strategy or course of action aimed at achieving a specific goal.
Example: "The committee developed a decisive plan to improve community engagement and participation in local events."
Alternatives: "a clear strategy to" or "a firm approach to".
"The chancellor has set out a decisive plan to reduce the UK's unprecedented deficit and restore confidence in the UK economy," the Treasury said in a statement.
The next day he reluctantly abandoned the idea of assaulting New York, writing that "[m]atters having now come to a crisis and a decisive plan to be determined on, I was obliged... to give up all idea of attacking New York..."....
Former Republican presidential candidate John McCain said the administration needed a more decisive plan to topple the Assad regime.
We commend him for offering a bold, decisive plan to combat climate change and to mitigate the impacts of carbon pollution.
The governor announced his plans in his State of the State address, calling it "part of a bold and decisive plan to rebuild our state's economy".
When Heraclius launched his offensive in May 636, Yazdegerd could not coordinate with the maneuver probably owing to the exhausted condition of his government and what would have been a decisive plan missed the mark.
"He hasn't made me feel like he has a decisive plan of action," she said.
The lack of a decisive plan for Britain's exit from the EU, and the possibility of having a "Remainer" running the country, have raised questions about what political motivation there will be for the next government to follow through at all on the referendum results, which were not politically binding.
"Faced with these challenges, we are today announcing decisive plans to further integrate the business and reduce the cost base, rationalise our product development and focus on fewer, bigger opportunities".
"We are implementing a decisive action plan to position our company for future growth and success".
Last September, after months of fraught discussions, the European commission unveiled a "decisive" EU plan to redistribute around the bloc 160,000 Syrian, Iraqi and Eritrean asylum seekers from the frontline countries of Italy and Greece over the next two years.
