Background: Aaron Benjamin Sorkin (born June 9, 1961) is an American screenwriter, director, producer, and playwright. His works include the Broadway plays A Few Good Men and The Farnsworth Invention; the television series Sports Night, The West Wing, Studio 60 on the Sunset Strip, and The Newsroom; and the films A Few Good Men, The American President, Charlie Wilson's War, Moneyball, and Steve Jobs. For writing The Social Network, he won the Oscar for Best Adapted Screenplay, among other awards. He made his feature directorial debut in 2017 with Molly's Game, which he also wrote.
Context: Sorkin got the inspiration to write his next play, a courtroom drama called A Few Good Men, from a phone conversation with his sister Deborah (who had graduated from Boston University Law School and signed up for a three-year stint with the U.S. Navy Judge Advocate General's Corps). Deborah told Sorkin that she was going to Guantanamo Bay to defend a group of Marines who came close to killing a fellow Marine in a hazing ordered by a superior officer. Sorkin took that information and wrote much of his story on cocktail napkins while bartending at the Palace Theatre. He and his roommates had purchased a Macintosh 512K so when he returned home he would empty his pockets of the cocktail napkins and type them into the computer, forming a basis from which he wrote many drafts for A Few Good Men.  In 1988, Sorkin sold the film rights for A Few Good Men to producer David Brown before it premiered, in a deal that was reportedly "well into six figures". Brown had read an article in The New York Times about Sorkin's one-act play Hidden in This Picture and found out Sorkin also had a play called A Few Good Men that was having Off Broadway readings. Brown produced A Few Good Men on Broadway at the Music Box Theatre. It starred Tom Hulce and was directed by Don Scardino. After opening in late 1989, it ran for 497 performances.  Sorkin continued writing Making Movies and in 1990 it debuted Off-Broadway at the Promenade Theatre, produced by John A. McQuiggan, and again directed by Don Scardino. Meanwhile, David Brown was producing a few projects at TriStar Pictures and tried to interest them in making A Few Good Men into a film but his proposal was declined due to the lack of star actor involvement. Brown later got a call from Alan Horn at Castle Rock Entertainment who was anxious to make the film. Rob Reiner, a Castle Rock producing partner, opted to direct it.
Question: How did the process of writing A Few Good Men go for Sorkin ?

Answer:
Sorkin took that information and wrote much of his story on cocktail napkins while bartending at the Palace Theatre.