Definition: Like series, but each proposition is a further step toward a climax.
Conjunctions: then, and, moreover, furthermore, etc.
Distinctions: Series, Situation-Response (Hover over a relationship to see how it differs.)
Series (S) vs Progression (P)
Progression is different from Series in that Progression moves in a direction, whereas Series takes the form of a cluster of ideas.
One helpful way to make this distinction is to try re-ordering the given propositions. If you can re-order them and the meaning is not significantly changed, it is a Series. If you find, rather, that the order does matter, it is a Progression.
Some of the best things to do in Philadelphia are seeing the liberty bell, going to an Eagle's game and eating a cheesesteak. (Series)
To tie your shoes, tighten the laces, make a knot, and confirm it is secure. (Progression)
Progression (P) vs Situation-Response (Sit/R)
Often times it is difficult to know how to relate the elements of a dialog.
The first thing you want to do is decide whether you are going to arc it with focus on the author's intent or with focus on the motives of the dialoging individuals. (Both can be helpful.) Where you land on this decision will likely determine your use of Progression (the author progressing his purpose along via the elements of the dialog) or Situation-Response (those in the dialog responding to one another).