What was McDonald's original fast-service operating system called when introduced by the McDonald brothers in 1948?

McDonald's original fast-service operating system, introduced in 1948, was called the Speedee Service System.

Richard and Maurice McDonald developed the system at their San Bernardino, California, restaurant after reorganizing the business around a short menu and rapid production. They emphasized hamburgers, fries, milkshakes, and standardized preparation rather than the broader carhop service common at the time.

The name connected the system with Speedee, an early McDonald's mascot shown as a chef. Speedee represented speed and consistency before Ronald McDonald became the chain's best-known character. The brothers' production methods later influenced Ray Kroc's expansion of McDonald's into a global franchise.

The Speedee Service System is sometimes confused with a restaurant name or a slogan. It was primarily an operating concept: a tightly organized method for preparing and serving inexpensive food quickly. Its importance in branding history is that it linked McDonald's identity to speed, uniformity, and convenience from the beginning.