This review starts with a brief introduction to gas chromatography-mas
s spectrometry (GC-MS) and multivariate analysis. It proceeds with a d
escription of the general strategy of extracting relevant quantitative
information from GC-MS instrumentation by latent variables in particu
lar. With respect to mass spectra and data analysis, several thorough
reviews have been written within the two major fields of classificatio
n and curve resolution techniques. As a consequence this review will f
ocus less on these two fields, and put more emphasis to latent variabl
es applied to GC-MS data in environmental field studies and spectrum-s
tructure/property modelling. To understand and operate a GC-MS system
of today, the chemist must be knowledgeable in gas chromatography, mas
s spectrometry, vacuum technology and computer science. It is my hope
that this review can aid both the skilled mass spectrometrist within t
he latter subject, as well as any scientist to achieve relevant inform
ation from supported chemical data in their own field of study.