Quais são as melhores práticas para analisar o uso de flashbacks e flash-forwards por um roteiro?

Defining these are a great way to know but I would say also flash forwards are used when also looking into future events. They aren't always triggered. For example time travel scripts we may be able to see the world they came from in flash forwards if they want to stop the event that is occurring. In flashbacks it may be relevant to the current character like in the movie Sunshine how the generations influenced the current ones POV as an example.

A good example of a flash forward is in "Twilight Saga: Breaking Dawn Part 2." Alice shows Aro his future in the battle scene.

Flashbacks in a script should be very short and purposeful to the story. The same can be said about flashforwards. I never liked flashforwards in a script because they end the story. If I know what's going to happen, why watch or read the rest?

The hero's journey is easier to identify and track through using flashbacks sometimes. Nevertheless, flashbacks need to be limited as they tend to bore the audience.

While this is true it may also help the audience connect the dots as well depending on that or show the inner struggle of a character. Like in a scene he just broke up with the gf and he goes back to the diner they ate in and he relives their fun times at it and then he goes rushing off to be with the gf.

I like flashback to show a character's backstory. It gives the viewer more insight as to the character's motivation. It helps the viewer have more empathy for the protagonist.

As long as the flashback or flash forward propels the story in an effective way, then it is useful. In "Secondhand Lions," the movie begins in the present, then the whole movie is a flashback telling the story. It circles back to the present. This is an excellent film!

When assessing them you also want to add that are they emotionally impactful in the story. Do they change your mind or with solid vs opinion forwards or flashbacks do they change a perspective on the audience as well of who this person is who the events.