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The MACH-IV is a 20 question Likert scale psychometric designed to test levels of Machiavellianism in individuals. In personality psychology, Machiavellianism refers to a personality construct which comprises manipulativeness, deceitfulness, and a callous, calculating orientation. It is the most widely used Machiavellianism test by researchers.
The Bem Sex-Role Inventory (BSRI) is a measure of masculinity and femininity, and is used to research gender roles. It assesses how people identify themselves psychologically. Sandra Bem's goal of the BSRI was to examine psychological androgyny and provide empirical evidence to show the advantage of a shared masculine and feminine personality versus a sex-typed categorization. The test is formatted with 60 different personality traits which participants rate themselves based on a 7-point Likert scale. Traits are evenly dispersed, 20 masculine, 20 feminine, and 20 filler traits thought to be gender neutral. All traits in the BSRI are positively valued personality aspects. Numerous past studies have found that gender categorizations are correlated with many stereotypical gendered behaviors.