The Grubel–Lloyd index measures intra-industry trade of a particular product. It was introduced by Herb Grubel and Peter Lloyd in 1971.

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GLIIT is divided into 4 categories for easier interpretation of the results. The first category are Strong inter-industrial trade tendencies, the second category are Weak inter-industrial trade tendencies, the third category are Weak intra-industrial trade tendencies, and the fourth category are Strong intra-industrial trade tendencies.

For easier interpretation of the results and thanks to the capabilities of the software, it has been added cell coloring based on the value of the results. RCA is colored with a red gradient.