A popular variation on the traditional three-act structure can be seen in Lawrence of Arabia and All About Eve.

	Lawrence of Arabia
OS		U
MC		Z
IC		Z
SS		Z

	All About Eve
OS		U
MC		Z
IC		Z
SS		Z

In both these examples, the Overall Story throughlines appear to be more segmented, seemingly more episodic than the traditional three-act structure. Their other throughlines, however, show a remarkable compliance with the bump-slide-bump form. Though more examples will need to be gathered to make anything more definitive, it's possible that this Variation II form is nearly as popular a screenplay form as the Variation I.