"Thinking It Over" is the debut single released by English-Irish pop group Liberty X, known at the time as Liberty. The 2-step-influenced song was produced by Pete Devereux (of Artful Dodger) and The Wideboys. It was co-written by band members Kelli Young and Tony Lundon. In the United Kingdom, the single was a hit, making the top five, but was not successful internationally, peaking at number 81 in Australia.

While the five winning contestants of Popstars formed Hear'Say, the five runner-up contestants formed the group Liberty. The name Liberty was chosen to reflect the freedom the members experienced following their participation in Popstars. Amidst pejorative media commentary, including the term "Flopstars", the band proceeded to sign a multimillion-pound record contract with Richard Branson's independent record label, V2 Records. Thus, their debut single, "Thinking It Over", was released on 24 September 2001. It came backed with three B-sides: "No Clouds", "Greed" and "Let's Get Working", the latter of which has never been released on CD in the United Kingdom.

The video for the track was filmed in a studio using green screen. It is set inside a skyline apartment in Manhattan, with the band performing in and around the lounge area. Despite the fact the video was filmed on a very low budget, it uses special effects to show and remove holographic images of the band from the apartment, to allow for different vocal sections of the song. It was the band's only video to be included on the physical single from the "Thinking It Over" era.

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