Organizing Our Organization

I should admit here that I'm tempted to ask you what you mean when you say that an essay doesn't "flow."  But I'm not going to do that.

Instead, I'm going to ask you this:  when you are working with a student who has problems with organization, how do you do that?  How do you know where the different bits of the essay go?  How do you explain it to the student?  Do you have any tricks that you show students?  Outlines?  Post-its?