Narrative - Three Act Structure

Act 1: is the first act of the film, usually is the first section of the film.
Act 1 starts and sets up the film, there is a point which introduces the characters and lets the audience see what type of character they are and how they act.

The main characters job is to draw the audience in and he has a specific focus, the incidence he has is usually half way through the first act in the film.

Act 2: is the second act of the film, it takes up the last half of the film. 
In act 2 there are problems, which prevent the main character from achieving what they need to. 

The first problem occurs half way through the film, this is where the main character should reach there aim or objective but this is where the problem occurs and they are to far away from reaching there target.

Act 3: is the final act of the film, this is the final section of the film

 
The climax is when the plot of the film reaches its biggest tension between the two opposite sides.