It was written by Benny Andersson, Björn Ulvaeus and Stig Anderson, with Anni-Frid Lyngstad singing the lead vocals.

"Knowing Me, Knowing You" proved to be one of ABBA's more successful singles, hitting #1 in West Germany (ABBA's sixth consecutive chart-topper there and had sold over 300,000 copies there by September 1979),[3] and the United Kingdom,[4] Ireland, Mexico and South Africa,[5] and reaching the top 3 in Austria, Belgium, the Netherlands and Switzerland.

In the United States, it became ABBA's sixth top 20 single, peaking at #14 on the Hot 100 and reaching #7 on Billboard's AC chart.

[7] Billboard reviewed the song and described it as a "melodically energetic but sad worded ditty about a romantic breakup.

"[8] Cash Box called it "a softly rocking record that combines memorable pop hooks in their distinctive reverb-soaked ambiance" and said that it has "a sound agreeable to just about any top 40 station.