Edward Norton has revealed that one of the toughest aspects of working on The Bourne Legacy was getting his head around all of the government terms and lingo.
The actor takes on the role of director of NRAG (National Research Assay Group) in the movie and just remembering everything was tough.
Speaking to the Press Association the actor said: "You do need to own these terms. Working in government, everything's an acronym.
"It's all like DARPA and NETRA and you don't even remember all the things. You sort of have to talk them as though you've been in that world for a decade."
This is a first appearance for Norton in the Bourne franchise as he teams up with Jeremy Renner and Rachel Weisz.
Norton has already enjoyed success this year as Moonrise Kingdom has been met well critically both in the U.S. and the UK.
But The Bourne Legacy is the first big budget project for the actor since he took on the role of Bruce Banner in The Incredible Hulk.
The Bourne Legacy is released 13th August.