Impostor feelings are widely discussed, yet the evidence has mostly come from small, cross-sectional student samples. This paper asks whether just three items can make that research practical at scale and over time. The Imposter Phenomenon is gaining increasing attention in academia, and it especially affects members of minority groups.

Nevertheless, there is little evidence for the occurrence and socio-structural correlates of the Imposter Phenomenon. The paper introduces the Impostor Phenomenon Short Scale, or IPSS-3, as a novel, time-efficient, and universally applicable measure, and connects impostor feelings to socio-structural characteristics.

Three data sets among German adolescents and adults support development, validation, and assessment of socio-structural correlates, with sample sizes of two hundred seventy-one, four hundred twenty-seven, and eight hundred sixty-five. The Imposter Phenomenon has so far been assessed almost exclusively through small-scale, cross-sectional surveys, usually based on highly selective student samples.

This may explain why key questions about its overall occurrence and socio-structural correlates remain unanswered. Key questions about the long-term evolution of the Imposter Phenomenon and its socio-structural correlates remain open. The lack of large-scale empirical studies is problematic because generalized conclusions about the far-reaching psychological implications of the Imposter Phenomenon seem to rely on a limited empirical database.

IP instruments differ across age groups, even though the Imposter Phenomenon seems relevant among youth, adolescents, and adults alike. Because of this, it is not yet possible to study the development of the Imposter Phenomenon within affected individuals over time in longitudinal panel studies starting, for example, in adolescence.

Most scales are also designed for specific social contexts, such as educational or work environments. The Impostor Phenomenon Short Scale was developed to address the lack of a universally applicable Imposter Phenomenon instrument. The IPSS-3 is based on the established Impostor Self-Concept Questionnaire.

A preliminary short version called ISCQ-5 was chosen as the base instrument because it is comparably short and recently developed. The base scale has a unidimensional factor structure and shows a highly positive correlation with the established CIPS scale. Table Two presents the IPSS-three, a time-efficient measure of impostor phenomenon feelings built from three modified statements about fear of failing, lacking knowledge or skills, and not meeting others’ expectations.

Respondents rate each item on six categories, from “does not apply at all” to “absolutely applies.” The authors evaluate this shorter scale with German adolescents, making the table important for showing exactly what is asked and how responses are recorded. In Study 1, both the original-item scale and the reformulated-item scale showed high loadings on a single factor, excellent reliability coefficients, and a high correlation of zero point nine seven.

That indicates that the linguistic item reformulations did not harm the quality of the scale. The confirmatory factor analysis used maximum likelihood, with robustness tested using maximum likelihood robust estimation. The robust estimation confirmed a single-factor structure for the IPSS-3.

Table 1 reports the IPSS-3’s factor loadings and unique variances using maximum likelihood estimation. All three items load on a single factor, with loadings of zero point eight seven, zero point eight two, and zero point eight five; the retained-factor result is one, with an eigenvalue of two point one five and variance of zero point seven two.

The Kaiser–Meyer–Olkin values are zero point six eight, zero point seven five, zero point six nine, with a total of zero point seven zero, documenting the scale’s measurement structure in Study 2. The IPSS-3 showed high reliability, with alpha and omega both equal to zero point eighty, only marginally below the preceding ISCQ-5, whose alpha and omega were both zero point eighty-eight.

Because the IPSS-3 is based on merely three items instead of five, the declined reliability can be regarded as acceptable. In Study 2, the IPSS-3 showed high loadings on a single factor, while reliability revealed lower but still acceptable values: alpha equal to zero point seventy-six and omega equal to zero point seventy-seven.

Table 3 lists correlations of the IPSS-3 with the three validation scales: ISCQ-5, IE-4 external, and BRS-5. Those correlations were significant and in the expected direction, suggesting a definite and reasonable association. Table three reports how the IPSS-3 relates to three validation scales.

Its correlation with the ISCQ-5 is zero point eight eight, while correlations are zero point three zero with external control beliefs and negative zero point four seven with self-esteem; all are marked with three asterisks, indicating statistical significance. The authors describe these associations as occurring in the expected directions, supporting the IPSS-3’s validity and reasonable applicability in large-scale, diverse surveys.

Table 4 summarizes central findings from comparisons of binary gender, migrant origin, and education, using t-test comparisons for significant differences in Imposter Phenomenon mean values. The findings suggest significant differences by gender, with the Female and Diverse group showing higher values, and between individuals with and without migrant origin, with the group possessing migrant origin showing higher values.

No significant difference in Imposter Phenomenon mean values was found between individuals with and without a university degree. Table four summarizes IPSS-three scores across gender, migration origin, and university education, using means, standard deviations, t-tests, and Hedges’s g.

The authors report a gender difference of minus zero point six six, with p less than zero point zero one, and a migration-origin difference of minus zero point eight zero, also with p less than zero point zero one. The education comparison is not statistically significant, with a difference of minus zero point two six and p equal to zero point two six, making socio-demographic context central to interpreting impostor-phenomenon intensity.

Study 3 found significant differences in Imposter Phenomenon mean scores between individuals with and without migrant origin. Scores were higher on average for individuals with migrant origin, at eight point thirty-three, compared with seven point fifty-three for those without migrant origin.

The paper presents several limitations to its results. The data relate only to the German version of the IPSS-3, so the paper recommends using only this version; future studies might validate English or other language versions. All findings are based on self-reports, so correlations with real-life criteria or other data sources, such as peer reports and grades, are not provided.

Because the study populations came from a convenience sample and a panel provider, the findings cannot be generalized to the general population, and large-scale evidence is still missing. The IPSS-3 is presented as a validated, time-efficient, and universally applicable instrument for capturing Imposter Phenomenon sentiments in large-scale assessments, including longitudinal survey designs.

It can facilitate research examining the importance of social contextual factors in the development and treatment of the Imposter Phenomenon. That research could support a more nuanced understanding of societal, institutional, and interpersonal aspects.

The IPSS-3 is presented as a validated, time-efficient measure for large-scale and longitudinal surveys, while the reported group differences suggest that impostor feelings are connected to social context rather than occurring in a vacuum.