Hallvard Føllesdal is associate professor of organizational psychology at the Department of Leadership and Organizational Management. He has a Ph.D. in psychology from the University of Oslo, on emotional intelligence and leadership. In his thesis, he questioned the validity of scores from a recognized test of emotional intelligence, along with the underlying theory. He has previously worked as a lecturer in personality psychology at the University of Oslo, and with leadership and organizational development in public administration.
Research areas Measurement of individual differences in the workplace:
personality, leadership, emotions, and well-being at work Teaching areas
Organizational behavior
Measurement of psychological constructs
The Big Five Inventory-2 (BFI-2) is one of the most frequently used personality measures in research, but several scales provide extreme scores. The present research shows that extreme scores are caused by the original rating scale, which uses the labels Disagree a little and Agree a little for the intermediate scale points 2 and 4, respectively. In contrast, other major personality inventories (and some BFI-2 versions) use the labels Disagree and Agree, respectively. In Study 1, respondents assessed the agreement expressed by the response labels in each scale. In Study 2, 150 Norwegian students completed the BFI-2 twice, applying both rating scales on the same occasion. In Study 3, 300 U.S. residents completed the English BFI-2 once, with one of the two scales. The original rating scale in the BFI-2 seems to cause extreme scores, and a graded response model reveals that it does not differentiate in the upper range of some personality traits. Moreover, the two different rating scales, which are both used with the BFI-2 (and the BFI), lead to significantly different scores on several personality scales. As researchers usually do not report the scale used, it can be challenging to compare results across studies.
Føllesdal, Hallvard (2024)
Agree or Agree a Little? The Rating Scale in the BFI-2 Causes Extreme Responses
Social Science Research Network (SSRN)
Føllesdal, Hallvard & Soto, Christopher J (2022)
The Norwegian Adaptation of the Big Five Inventory-2