In 2011, writer Mark Protosevich was hired. He wrote two story treatments, neither of which were approved. Spielberg and Kennedy felt that the film did not yet have an adequate story. In 2012, Rick Jaffa and Amanda Silver were hired to write the script. The writers incorporated three ideas from Spielberg: a fully functioning dinosaur theme park, a human who has a relationship with trained raptors (from Sayles's earlier draft), and a human-eating dinosaur that escapes and has to be stopped.