There are about 4, but I think the most important are~
To persuade and to inform.
Answer:
1.Identify the problem you are researching on
2.Review the literature of the past work or related work on that same research
3.clarify the problem
4 clearly define term and concepts you would like to use to undergo your finds and draw you conclusions
5 define you population or target group
Explanation:
that would imply the fact that he made history with his LAWS of physics so the answer is LAW