When to use a comma before "in turn":
* When "in turn" introduces a consequence or result:
* "The storm knocked out power, in turn causing the traffic lights to malfunction."
* When "in turn" introduces a series of actions or events:
* "The team won the game, in turn securing their place in the playoffs."
When to NOT use a comma before "in turn":
* When "in turn" modifies a preceding noun:
* "The in turn action of the machine caused the problem."
* When "in turn" is part of a phrase that's tightly integrated into the sentence:
* "The plan was to first acquire the materials, in turn assembling the components."
It's helpful to read the sentence aloud. If you naturally pause before "in turn," a comma is likely appropriate. If the phrase flows smoothly without a pause, a comma isn't needed.