With a worldwide sample of students (N = 77, 387), this paper reviews and analyses the psychometric properties of the Student Leadership Practices Inventory [1]. Modest to strong internal reliability coefficients are found across a number of different dimensions. Predictive validity of the instrument is supported, with the instrument being able to differentiate between effective and ineffective leaders using both self-reported and observer (constituent) data. Few significant differences are found on the basis of respondent gender, ethnicity, nationality, or institutional level (high school versus college). Implications for developing student leaders and future research are offered.