Who are we and what do we do?

The Human Accuracy Lab (HAL) is founded by Emir Efendić and Philippe van de Calseyde. We are psychology researchers working in the Netherlands on topics related to judgment and decision making.

Our mission is twofold. First, we investigate the individual and situational factors that enhance the accuracy of human judgments and decisions. Second, we design and test algorithms that efficiently identify and select accurate responses from a pool of responses. To pursue this research agenda, we employ experiments, field studies, and computational modeling.

Explore this page to stay up to date on our current research and projects.

Selected publications

Van de Calseyde, P., & Efendić, E. (2025). Disagreeing perspectives enhance inner-crowd wisdom for difficult (but not easy) questions. Psychological Science, 36(3), 147–156.

Efendić, E., Van de Calseyde, P., Bahnik, Š., & Vranka, M. (2023). Taking algorithmic (vs. human) advice reveals different goals to others. International Journal of Human-Computer Interaction, 40(1), 45–54.

Van de Calseyde, P., & Efendić, E. (2022). Taking a disagreeing perspective improves the accuracy of people’s quantitative estimates. Psychological Science, 33(6), 971–983.

Efendić, E., Van de Calseyde, P., & Evans, M. A. (2020). Slow response times undermine trust in algorithmic (but not human) predictions. Organizational Behavior and Human Decision Processes, 157, 103–114.

See all publications →