The General Inventory of Symptoms, Behaviours, and Opinions (GIBSO)

GIBSO is a newly created measure tapping into underreporting across different domains (health, behaviour, and attitude). It contains 48 items in its full form, but it can also be used as a 37-item version. It includes the attention and understanding checks, making sure that the examined protocols are valid.

Currently, GIBSO is available in English, Dutch, German, French, Italian, Spanish, and Serbian.

In case you wish to receive the measure and use it in your practice, or include it in your research, feel free to contact me.

References to published work and ongoing projects are given below.

References & Current Projects on GIBSO:

Bošković, I., Merckelbach, H., Bosco, F., & Roma, P. (2026). Measuring and Priming Underreporting Using the General Inventory of Behaviours, Symptoms, and Opinions (GIBSO). The European Journal of Psychology Applied to Legal Context, 18, e260183. https://doi.org/10.5093/ejpalc2026a8

Bošković, I., & Rowlands, M. T. (2025). New Measure of Underreporting on Horizon: Initial Psychometric Evaluation of the General Inventory of Behaviour, Symptoms, and Opinions (GIBSO). Psychological Injury and Law, 18(1), 84-96. https://doi.org/10.1007/s12207-024-09527-2

Bošković, I., & Merckelbach, H. (2024). The General Inventory of Symptoms, Behaviours, and Opinions (GIBSO). Unpublished manual.

Bosco, F., Bošković, I., Roma, P. (ongoing project). The Effectiveness of Gibso and Mmpi L in Identifying Positive Response Bias: A Simulation Study. Preprint available at: https://ssrn.com/abstract=4988646

Maatz, L., Krieger, B., & Bošković, I., (in preparation). Examining the Prevalence of Underreporting in German Sample using GIBSO.