By Jonathon Dornbush
November 17, 2014 at 06:41 PM EST
Theo Wargo/Getty Images

Though Aaron Sorkin’s Steve Jobs biopic still hasn’t found its Jobs, the screenwriter has offered up a few more details about the film, as well as why finding someone to fill the role has been such a challenge.

In an interview with The Independent, Sorkin opened up about how Jobs’ daughter Lisa became a major facet of his writing process. Lisa, whom Jobs initially denied paternity of but later reconnected with when she was in her teens, spoke to Sorkin. These conversations were a coup for the writer, as Lisa did not speak to Walter Isaacson for the biography on which the film is based.

“She didn’t participate in Walter Isaacson’s book, because her father was alive at the time, and she didn’t want to alienate either of her parents,” Sorkin said. “So I was very grateful that she was willing to spend time with me. She is the heroine of the movie.”

Sorkin didn’t elaborate on the role Lisa will play in the film; its unique structure won’t allow for much of a direct look into Jobs’ home life. Sorkin has explained that his script will essentially only have three scenes, each running in real time and covering the events before the launch of three major products in Jobs’ career.

That focused take on Jobs’ life means the character is onscreen a lot. Sorkin offers this as a possible reason why Christian Bale and Leonardo DiCaprio have reportedly declined the role. His 181-page script—a daunting number in itself—contains “about 100 [pages]” on which Jobs appears, according to Sorkin. Sorkin also promised The Independent that an announcement about who will fill Jobs’ shoes is close.

Read the rest of The Independent‘s interview for more from Sorkin about his career, as well as some of his thoughts on The Newsroom as it completes its final season.