"in decisive ways" is a correct and usable phrase in written English.
It is typically used to describe actions or behaviors that have a significant or critical impact on a situation or outcome. Here is an example sentence: "The CEO's leadership skills have shaped the company in decisive ways, leading to its success in a highly competitive market."
Noguchi found intriguing forms everywhere, and they influenced his work in decisive ways.
Catholic activists have worked tirelessly to alleviate poverty while also contributing in decisive ways to the anti-war and anti-death penalty movements of recent decades.
But those cases differed from China in decisive ways: the Beijing government has raised the living standards for hundreds of millions of people over the last generation, and, importantly, its security services are well-fed and well-funded.
His "IBM and the Holocaust" drops the bombshell of a revelation that the Nazis, in pursuing the destruction of European Jewry, were assisted in decisive ways by a leading American corporation.
Thus, in his early work, Gerald Dworkin argues that someone who identifies with his motives lacks autonomy if this identification reflects the fact that he has "been influenced in decisive ways by others in such a fashion that we are not prepared to think of it as his own choice" (Dworkin 1976, 25).
These both identities imply that the powers of affect the convergence to zero of the terms in (2.14), in decisive way.
They added that at the moment, Iran's leaders saw that "the regional balance is shifting, in potentially decisive ways, against their American adversary and in favor of the Islamic Republic".
It was well known that geometric considerations enter in a decisive way in many questions of harmonic analysis.
Unless U.S. policy fails in a decisive way in Iraq, the administration will attempt to cushion the blow from setbacks that are experienced.
Occasionally one senses frustration at the state department with the White House's reluctance to get involved in Syria in any decisive way - first because 2012 was an election year and now because there are no good, clear options.
Induced by a context of massive and easy access to energy and by the progress of medicine, this history that precedes us, that can be described as cultural, has largely ignored the physical, geographical, climatic, or bacteriological reasons that have, in reality, shaped, in a decisive way, over centuries, the architectural form, that of buildings, from cities to interior decoration.
