What was the name of McDonald's restaurant system introduced by the McDonald brothers in 1948?

The McDonald brothers introduced the Speedee Service System in 1948.

Richard and Maurice McDonald developed the system after reorganizing their San Bernardino, California, restaurant. They reduced the menu, standardized preparation, and arranged work in an assembly-line style so food could be produced quickly and consistently.

The system was a branding milestone as well as an operating innovation. Its name communicated the restaurant's central promise directly, and the Speedee mascot reinforced that message. The approach later influenced the wider fast-food industry and helped make McDonald's format highly repeatable.

The Speedee Service System is sometimes confused with the later corporate McDonald's System associated with Ray Kroc's expansion. Kroc built on the McDonald brothers' operating model, but the 1948 system originated with Richard and Maurice McDonald.