"How Little We Know" is a song written by Hoagy Carmichael and Johnny Mercer for the 1944 film To Have and Have Not, where it is performed by the character "Slim" played by Lauren Bacall.
[1] After the film's release, it was a hit recording sung by Judy Johnson.
Nick Perito and his orchestra recorded an instrumental cover of the song for Muzak's Stimulus Progression program in the 1970s.
In 1948, a recording of "How Little We Know" by British singer Steve Conway was released by Columbia.
[3] This song should not be confused with the Carolyn Leigh/Phillip Springer composition "(How Little It Matters) How Little We Know", which was first recorded by Frank Sinatra in 1956.