Haryanta pursued a Bachelor’s degree in Psychology at Universitas Gadjah Mada (UGM) and successfully obtained the title of Bachelor of Psychology in 1998. In his research titled “The Relationship Between the Intensity of Employee Involvement in Quality Control Circle Activities and Work Ethic,” he was guided by Prof. Dr. Asip F. Hadipranata. In 2000, Haryanta obtained a degree in Psychology from the same institution. He then continued his master’s studies in Psychology with a focus on Psychometrics at UGM and earned his Master’s degree in 2008. The thesis he wrote is titled “Analysis of the Quality of the UGM Potential Test 2007.”

Ramadhan Dwi Marvianto, S.Psi., M.A., is a young lecturer in the field of Psychometrics. Marvi completed his undergraduate (S1) and master’s (S2) studies at the Faculty of Psychology, Universitas Gadjah Mada, with a specialization in Applied Psychometrics. During his educational studies, he participated extensively in seminars and workshops on statistics and psychometrics, both as a speaker and a participant. Marvi’s participation is a form of commitment to deepen and disseminate the knowledge of statistics and psychometrics that he possesses.

Lavenda Geshica, S.Psi., M.A., is an academic in the field of Psychology. Currently, Lavenda Geshica, S.Psi., M.A., is pursuing a PhD in Mental Health at the University of Glasgow. During her doctoral studies, she is actively involved as a member of the Suicidal Behaviour Research Laboratory (SBRL) at the University of Glasgow. Additionally, she actively participates in training related to suicide prevention, such as Applied Suicide Intervention Skills Training (ASIST) and SafeTALK.

Dr. Muhammad Dwirifqi Kharisma Putra, S.Psi., M.Si. completed his undergraduate studies at the Faculty of Psychology, UIN Syarif Hidayatullah Jakarta, in 2014. He subsequently completed his master’s degree in Psychometrics in the Master’s Program in Psychological Science at UIN Syarif Hidayatullah Jakarta in 2016, with a thesis entitled “The Effects of Sample Size and Intraclass Correlation Coefficients (ICC) on Parameter Estimation Bias in Multilevel Latent Variable Modeling: A Monte Carlo Simulation Study.” In 2026, he completed his doctoral degree in Psychological Science at Universitas Gadjah Mada, with a dissertation entitled “Development of a Statistical Literacy Instrument and Standard-Setting for Undergraduate Psychology Students: A Study Based on the Rasch Model.” He is currently active in research and book writing in the fields of psychometrics, as well as educational measurement and evaluation. To date, he has contributed to the authorship and publication of more than 40 scholarly works, including journal articles, books, book chapters, conference proceedings, and other academic publications. He is also active as an editor for several national journals and as a reviewer for several international journals, including Current Psychology, Social Sciences & Humanities Open, and MethodsX.

Samudera Fadlilla Jamaluddin, S.Psi., M.Sc. completed his undergraduate education at the Faculty of Psychology, Universitas Gadjah Mada. After that, he continued his education by enrolling in a Master by Research program in Social Psychology: Regulation of Social Behavior, which is a program under the Department of Experimental and Applied Psychology at Vrije Universiteit Amsterdam. During his studies, he learned a lot about the use of evolutionary psychology paradigms to examine human behavior. He was also equipped with skills to design experimental research in the context of social behavior.

Wahyu Jati Anggoro, S.Psi., M.A. is an academic and researcher in the fields of Psychometrics and Social Relations. He completed his undergraduate (S1) and master’s (S2) education at the Faculty of Psychology, Universitas Gadjah Mada, demonstrating his commitment to this institution and his deep understanding of psychology in the Indonesian context.

Wahyu Widhiarso, S.Psi., M.A. is a prominent academic and researcher in the fields of psychometrics, educational evaluation, and educational psychology. I am currently pursuing a doctoral degree in the Department of Methodology and Research Evaluation at the University of Jena, Germany, with a dissertation on the exploration of item attributes that are resistant to response faking. Previously, Wahyu obtained a bachelor’s and master’s degree in psychology from Universitas Gadjah Mada, Indonesia.