Write a persuasive message to your boss explaining why you should get

a raise, OR write a persuasive message to your landlord explaining why your rent
should not be raised.

2 answers

Jot an outline of your points. Avoid the trite issues.

Once you have your points, write.

We will be happy to critique your thinking.
It's nice to start with some positive points, before you request any change. For example, "I really enjoy working here..." followed by a "...but...."

Here are some articles that might be helpful.

http://www.members.cox.net/dagershaw/lol/MessageAcross.html
http://www.members.cox.net/dagershaw/lol/Persuasion.html
http://www.members.cox.net/dagershaw/lol/InfluenceAntecedents.html
http://www.members.cox.net/dagershaw/lol/InfluenceMorePrinciples.html
http://www.members.cox.net/dagershaw/lol/InfluenceStillMore.html

I hope these help a little more. Thanks for asking.