Before the widespread use of digital non-linear editing systems, the initial editing of all films was done with a positive copy of the film negative called a film workprint (cutting copy in UK) by physically cutting and splicing together pieces of film.[7] Strips of footage would be hand cut and attached together with tape and then later in time, glue. Editors were very precise; if they made a wrong cut or needed a fresh positive print, it cost the production money and time for the lab to reprint the footage. Additionally, each reprint put the negative at risk of damage. With the invention of a splicer and threading the machine with a viewer such as a Moviola, or "flatbed" machine such as a K.-E.-M. or Steenbeck, the editing process sped up a little bit and cuts came out cleaner and more precise. The Moviola editing practice is non-linear, allowing the editor to make choices faster, a great advantage to editing episodic films for television which have very short timelines to complete the work. All film studios and production companies who produced films for television provided this tool for their editors. Flatbed editing machines were used for playback and refinement of cuts, particularly in feature films and films made for television because they were less noisy and cleaner to work with. They were used extensively for documentary and drama production within the BBC's Film Department. Operated by a team of two, an editor and assistant editor, this tactile process required significant skill but allowed for editors to work extremely efficiently.