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AllMusic
Chicago Tribune
Entertainment Weekly	A+
Los Angeles Times
NME	6/10
Pitchfork	8.5/10
Q
Record Mirror
The Rolling Stone Album Guide
Vox	6/10

Behaviour. (stylised as Behavior. in the original US pressing) is the fourth studio album by English synthpop duo Pet Shop Boys. It was first released in 1990. A special edition Japanese release included an additional Mini CD, exclusive artwork and printed lyrics in a white velvet-like box.

Harold Faltermeyer produced Behaviour. at his "Red Deer" studio in Munich, Germany. Because they were dissatisfied with the available digital synthesisers and samples, Pet Shop Boys wanted to use analogue synthesisers. Faltermeyer was a good choice for producer as he happened to be an expert on analogue equipment. The result was a Pet Shop Boys album different from both the previous album, Introspective and the 1993 follow-up, Very. In places, the album expands upon the synthpop genre with flavours of guitar pop ballads, as with "This Must Be the Place I Waited Years to Leave" and "My October Symphony" featuring guitarist, Johnny Marr. Later, singer Neil Tennant would reflect on the different style of Behaviour., "It was more reflective and more musical-sounding, and also it probably didn't have irritatingly crass ideas in it, like our songs often do". Tennant later reflected the album was inspired by fellow synthpop group Depeche Mode's album Violator, which was also released in 1990. The album was certified Gold in Spain.

Along with the others of the group's first six studio albums, in 2001, Behaviour. was re-released as Behaviour./Further Listening: 1990–1991. The re-released version was digitally remastered, and accompanied with a second disc of B-sides, and some previously unreleased songs, recorded since the year 1990 to the year 1991. Notable songs on the second disc include "Miserablism", "DJ Culture", "Was It Worth It?", and the Ambient Mix of "Music for Boys". "Miserablism", a poignant satire of Morrissey, was intended for inclusion on Behaviour. up until the day it was sent for mastering. It later became the b-side for "Was It Worth It?" and was remixed by Moby for the single of 12"; it was also featured on the limited edition version of the 2003's compilation album, PopArt: Pet Shop Boys – The Hits. "DJ Culture" and "Was It Worth It?" were the two singles recorded for the Pet Shop Boys' 1991's compilation album, Discography: The Complete Singles Collection. "Music for Boys" was originally credited as "Music for Boys Part 2" and was the b-side to "DJ Culture". The original B-side version can also be found on the 1995 compilation album Alternative.

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