Increasingly, films and television productions are edited on computer editing equipment, although feature films are still edited in the traditional way on viewing devices known as Moviolas or flat-bed editing machines. In the traditional method of editing, editors run strips of film through these machines at various speeds. They mark frames where a particular shot or piece of sound is to begin or end. After the scenes are edited, assistant editors join separate strips of film on a splicer. The sequences are then ready for viewing.
Computer editing uses personal computers and special software to rearrange film sequences.
Assistant editors do more than splice film. They are responsible for preparing the work for editors, ordering whatever is needed, maintaining schedules, arranging screenings for the directors and producers, supervising apprentices, and providing all necessary general support for Film Editors. In the television industry almost all work is done on videotape rather than film. Videotape editing requires some additional special training on the various electronic equipment used in the editing process. Assessing how well one is doing when learning or doing something.