Who is credited with developing the scientific method?
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Who formalized the scientific method?
Francis Bacon
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Who pioneered the experimental scientific method?
Galileo Galilei
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Who did early work in creating the scientific method?
Aristotle
Both Bacon and Descartes wanted to provide a firm foundation for scientific thought that avoided the deceptions of the mind and senses. Bacon envisaged that foundation as essentially empirical, whereas Descartes provides a metaphysical foundation for knowledge. If there were any doubts about the direction in which scientific method would develop, they were set to rest by the success of Isaac Newton. Implicitly rejecting Descartes' emphasis on rationalism in favor of Bacon's empirical approach, he outlines his four "rules of reasoning" in the "Principia",
Who refined the process to develop the modern scientific method?
Isaac Newton
History of scientific method
Scientific method
https://en.wikipedia.org/wiki/Scientific%20method
History of scientific method
https://en.wikipedia.org/wiki/History%20of%20scientific%20method
Francis Bacon, 1st Viscount St Alban,[a] Kt, PC, QC (/ˈbeɪkən/;[5] 22 January 1561 – 9 April 1626) also known as Lord Verulam, was an English philosopher and statesman who served as Attorney General and as Lord Chancellor of England. His works are seen as developing the scientific method and remained influential through the scientific revolution.
Francis Bacon
He argued for the possibility of scientific knowledge based only upon inductive reasoning and careful observation of events in nature. Most importantly, he argued science could be achieved by the use of a sceptical and methodical approach whereby scientists aim to avoid misleading themselves. Although his most specific proposals about such a method, the Baconian method, did not have long-lasting influence, the general idea of the importance and possibility of a sceptical methodology makes Bacon the father of the scientific method. This method was a new rhetorical and theoretical framework for science, whose practical details are still central to debates on science and methodology.
Francis Bacon
 the "father of the scientific method",[
Galileo Galilei
His work marked another step towards the eventual separation of science from both philosophy and religion; a major development in human thought. He was often willing to change his views in accordance with observation. In order to perform his experiments, Galileo had to set up standards of length and time, so that measurements made on different days and in different laboratories could be compared in a reproducible fashion. 
Galileo Galilei
the father of scientific method
Aristotle
Aristotle introduced what may be called a scientific method.[16] His demonstration method is found in Posterior Analytics. He provided another of the ingredients of scientific tradition: empiricism. For Aristotle, universal truths can be known from particular things via induction. To some extent then, Aristotle reconciles abstract thought with observation, although it would be a mistake to imply that Aristotelian science is empirical in form. Indeed, Aristotle did not accept that knowledge acquired by induction could rightly be counted as scientific knowledge. Nevertheless, induction was for him a necessary preliminary to the main business of scientific enquiry, providing the primary premises required for scientific demonstrations.
History of scientific method
Isaac Newton's statement of the four rules revolutionised the investigation of phenomena. With these rules, Newton could in principle begin to address all of the world's present unsolved mysteries. He was able to use his new analytical method to replace that of Aristotle, and he was able to use his method to tweak and update Galileo's experimental method. The re-creation of Galileo's method has never been significantly changed and in its substance, scientists use it today.
Philosophiæ Naturalis Principia Mathematica Rules of Reasoning in Philosophy
four rules, as they came finally to stand in the 1726 edition, Newton effectively offers a methodology for handling unknown phenomena in nature and reaching towards explanations for them.
Philosophiæ Naturalis Principia Mathematica Rules of Reasoning in Philosophy
an English mathematician, physicist, astronomer, theologian, and author 
Isaac Newton
was an Italian astronomer, physicist and engineer, sometimes described as a polymath, from Pisa.
Galileo Galilei
was a Greek philosopher and polymath during the Classical period in Ancient Greece
Aristotle
Francis Bacon, Galileo Galilei, Aristotle and Isaac Newton are all credited with developing the scientific method. Francis Bacon, also known as Lord Verulam, was an English philosopher and statesman who served as Attorney General and as Lord Chancellor of England. His works are seen as developing the scientific method and remained influential through the scientific revolution. Bacon argued for the possibility of scientific knowledge based only upon inductive reasoning and careful observation of events in nature. Most importantly, he argued science could be achieved by the use of a skeptical and methodical approach whereby scientists aim to avoid misleading themselves. Although his most specific proposals about such a method, the Baconian method, did not have long-lasting influence, the general idea of the importance and possibility of a skeptical methodology makes Bacon the father of the scientific method. This method was a new rhetorical and theoretical framework for science, whose practical details are still central to debates on science and methodology. However, Galileo Galilei has also been called  the father of the scientific method. Galileo was an Italian astronomer, physicist and engineer, sometimes described as a polymath, from Pisa. His work marked another step towards the eventual separation of science from both philosophy and religion, a major development in human thought. Galileo was often willing to change his views in accordance with observation. In order to perform his experiments, Galileo had to set up standards of length and time, so that measurements made on different days and in different laboratories could be compared in a reproducible fashion. However, Aristotle is also called the father of the scientific method, as he introduced what may be called a scientific method. Aristotle was a Greek philosopher and polymath during the Classical period in Ancient Greece. Aristotle provided another one of the ingredients of scientific tradition, empiricism. For Aristotle, universal truths can be known from particular things via induction. To some extent then, Aristotle reconciles abstract thought with observation, although it would be a mistake to imply that Aristotelian science is empirical in form. Indeed, Aristotle did not accept that knowledge acquired by induction could rightly be counted as scientific knowledge. Nevertheless, induction was for him a necessary preliminary to the main business of scientific inquiry, providing the primary premises required for scientific demonstrations. However, in 1726, Isaac Newton's statement of the four rules revolutionized the investigation of phenomena. Newton was an English mathematician, physicist, astronomer, theologian, and author. With his four rules, Newton effectively offers a methodology for handling unknown phenomena in nature and reaching towards explanations for them. With these rules, Newton could, in principle, begin to address all of the world's present unsolved mysteries. Newton was thus able to use his new analytical method to replace that of Aristotle's, and he was able to use his method to tweak and update Galileo's experimental method. The re-creation of Galileo's method has never been significantly changed and in its substance, scientists still use it today.