Parallel editing is a cinematographic technique that alternates between two sequential planes in order to give the spectator the sensation of several things happening simultaneously. That is, in this type of editing, the movie shows, in a single scene, several actions that are in different sequential plane, but occur at the same time.
So if in a movie we have a bank robbery taking place and at the same time we have another related action going on across the city - the police being warned and moving to get to the bank - most filmmakers call this montage, Parallel editing.
