Field and The Three Act Structure

In Hollywood films the narrative tends to be organised in what is called the "three act structure".
The writer Syd Field has identified what he calls the ideal Paradigm three act structure.
In this structure the film must be set-up within the first 20-30 minutes before the main character experiences a 'plot point' that gives them a goal to achieve. 
Approximately half the movies running time must be taken up with the characters struggle to achieve their goal ; this is the 'Confrontation period'. 
Field also refers, sometimes to the midpoint, a more subtle turning point that happens in Act 2 - the confrontation which often has an apparently devastating reversal of the main characters fortune. 
The final quarter of the film(third act) depicts a climatic struggle by the protagonist to finally achieve (or not) their goal and the aftermath of this struggle.