The phrase "a decisive step to" is correct and can be used in written English.
It typically follows a verb and indicates that something is an important or critical action towards achieving a goal. Example: "The new policy was seen as a decisive step to improving employee morale."
The bill is a decisive step to achieve this goal".
"I ask you to seize the opportunity and take a decisive step to help Ukraine return to the path of peaceful development.
I am pleased that a key group of research funders, driven by a collective sense of duty to care for the good functioning of the scientific system, has committed to take a decisive step to change the situation.
Officials said European countries might take a decisive step to sanction Syria's oil and gas industry this month, which would cripple one of Syria's few remaining sources of revenue as its economy reels under the strain of the uprising.
The Bank of England has taken a decisive step to restore confidence in the banking system.The "special liquidity scheme" launched this week puts Britain's central bank at the forefront of international attempts to arrest the financial crisis.
BRUSSELS — Stock markets and the euro dropped Thursday as investors registered worries that a meeting of leaders of the 17 euro zone nations Friday would not pave the way for a decisive step to end their debt crisis.
The event this month was not only the executive's way of announcing the latest H & M designer collaboration, with the French fashion designer Sonia Rykiel, but also a first decisive step to show some post-recessionary fun.
The Atlantic Coast Conference on Sunday announced a swift and decisive step to broaden its geographic and economic footprint by officially inviting Syracuse University and the University of Pittsburgh to join the league.
Poroshenko called it a "first but very decisive step" to moving Ukraine closer to Europe.
The Ukrainian president, Petro Poroshenko called it a "first but very decisive step" to moving Ukraine closer to Europe.
Today we are taking a decisive step forward to help deliver our manifesto commitment, and I commend this statement to the House".
