Rules to keep in mind to devise a strong argument:
Claim is the point an arguer is trying to make and wants another to accept. When a claim is made, the question to be asked is “What is your point?”
Example: The Ravens will win the Super Bowl this year.
Visualization refers to the proof or evidence an arguer offers. Grounds answers the questions, “What is your proof?”. It can consist of statistics or reports via physical evidence of reasoning.
Example: They have the best defense in the league.
Warrant is the inferential leap that performs a “linking” function by establishing a mental connection between the grounds and the claim
Example: The team with the best defense usually wins.
Backing consists of evidence to support the type of reasoning employed by the warrant.
Example: The team with the best defense has won each of the last five years.
Qualifier states how sure the arguer is about his/her claim
Example: The probability that the Jets will win the Super Bowl is 80 percent.
Rebuttal admits to those circumstances or situations where the argument would not hold.
Example: Anything could happen. The Ravens defense might have a lot of injuries.
Reference: http://commfaculty.fullerton.edu/rgass/toulmin2.htm