The Klein Sexual Orientation Grid (KSOG) developed by Fritz Klein attempts to measure sexual orientation by expanding upon the earlier Kinsey scale.  Klein first described the KSOG in his 1978 book The Bisexual Option. In response to the criticism of the Kinsey scale only measuring two dimensions of sexual orientation, Klein developed a multidimensional grid for describing sexual orientation. Unlike the Kinsey Scale, the Klein grid investigates sexual orientation in the past, the present and in the idealized future with respect to seven factors each, for a total of twenty-one values. The KSOG uses values of 1–7, rather than the 0–6 scale of the Kinsey Scale, to describe a continuum from exclusively opposite-sex to exclusively same-sex attraction. Shortcomings Another concern with the KSOG is that different dimensions of sexual orientation may not identify all people of a certain orientation in the same way. Measures of sexual attraction, sexual activity, and sexual identity identify different (though often overlapping) populations. Laumann et al. (1994) found that of the 8.6\% of women reporting some same gender sexuality, 88\% reported same gender sexual attraction, 41\% reported some same gender sexual behaviour and 16\% reported a lesbian or gay identity. Thus, it is not clear what exactly the scale may be measuring as depending on which aspect is taken into consideration, sexual orientation may or not be revealed. Further reading Klein, Fritz, MD. The Bisexual Option, Second Edition. Binghamton, NY: The Haworth Press, 1993. .  .
The Klein Sexual Orientation Grid (KSOG) developed by Fritz Klein attempts to measure sexual orientation by expanding upon the earlier Kinsey scale. Fritz Klein founded the American Institute of Bisexuality in 1998 which is continuing his work by sponsoring bi-inclusive sex research, educating the general public on sexuality, and promoting bi culture and bi community. Klein first described the KSOG in his 1978 book The Bisexual Option. In response to the criticism of the Kinsey scale only measuring two dimensions of sexual orientation, Klein developed a multidimensional grid for describing sexual orientation. Unlike the Kinsey Scale, the Klein grid investigates sexual orientation in the past, the present and in the idealized future with respect to seven factors each, for a total of twenty-one values. The KSOG uses values of 1–7, rather than the 0–6 scale of the Kinsey Scale, to describe a continuum from exclusively opposite-sex to exclusively same-sex attraction. Limitations Another concern with the KSOG is that different dimensions of sexual orientation may not identify all people of a certain orientation in the same way. Measures of sexual attraction, sexual activity, and sexual identity identify different (though often overlapping) populations. Laumann et al. (1994) found that of the 8.6\% of women reporting some same gender sexuality, 88\% reported same gender sexual attraction, 41\% reported some same gender sexual behaviour and 16\% reported a lesbian or gay identity. Further reading Klein, Fritz, MD. The Bisexual Option, Second Edition. Binghamton, NY: The Haworth Press, 1993. . . Klein Sexual Orientation Grid - Online version of original Klein Sexual Orientation Grid .
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Fritz Klein founded the American Institute of Bisexuality in 1998 which is continuing his work by sponsoring bi-inclusive sex research, educating the general public on sexuality, and promoting bi culture and bi community.
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Shortcomings
Limitations
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Thus, it is not clear what exactly the scale may be measuring as depending on which aspect is taken into consideration, sexual orientation may or not be revealed.
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. Klein Sexual Orientation Grid - Online version of original Klein Sexual Orientation Grid