“Eighty percent of a picture is writing, the other twenty percent is the execution, such as having the camera on the right spot and being able to afford to have good actors in all parts.”
As quoted in The New Hollywood : American Movies in the '70s (1975) by Axel Madsen
Help us to complete the source, original and additional information
Billy Wilder 23
American filmmaker 1906–2002Related quotes

“A desire not to butt into other people's business is at least eighty percent of all human wisdom.”
Source: Stranger in a Strange Land

Matsuo Bashō, Collected Haiku Theory, eds. T. Komiya & S. Yokozawa, Iwanami, 1951 (Unknown translator)
Statements

“Eighty percent of success is showing up.”

“Eighty percent of married men cheat in America. The rest cheat in Europe.”
Quoted in [Bill, Maxwell, In gloomy times, let's try to find a sense of humor, http://www.sptimes.com/2002/07/07/Columns/In_gloomy_times__let_.shtml, 2002-07-07, 2008-10-04, St. Petersburg Times]

… The twenty-five percent is for error.
Pauling's reply to an audience question about his ethical system, following his lecture circa 1961 at Monterey Peninsula College, in Monterey, California.
1990s

“99.99 percent of all species that have ever lived are no longer with us.”
Source: A Short History of Nearly Everything