International Journal of Human Research and Social Science Studies

This study examines the influence of birth order on the decision-making styles and general self-efficacy of adults. Grounded in Alfred Adler's birth order theory and contemporary frameworks of cognitive decision-making, the research explores how one's ordinal position within the family is associated with preferred approaches to making decisions and overall confidence levels. Using a quantitative research design, data were collected from a purposive sample of 388 adults, with birth order, decision-making styles (rational, intuitive, dependent, avoidant, spontaneous), and general self-efficacy measured via validated scales. Findings reveal that firstborns report significantly higher levels of general self-efficacy and a stronger preference for a rational decision-making style, while lastborns show a greater propensity for an intuitive decision-making style. Mediation analysis indicates that self-efficacy partially explains the relationship between birth order (firstborn vs. lastborn) and rational decision-making. The study highlights that birth order functions as a probabilistic factor that shapes confidence, which in turn influences cognitive strategies for decision-making. Implications for organizational behavior, team composition, and personal development include leveraging innate strengths and designing targeted training to build complementary skills across different birth order profiles.

Birth Order, Decision-Making Styles, Self-Efficacy, Confidence, Adlerian Theory

1. Damian, R. I., & Roberts, B. W. (2015). The associations of birth order with personality and intelligence in a representative sample of U.S. high school students. Journal of Research in Personality, 58, 96-105.
2. Eckstein, D. (2000). Empirical studies indicating significant birth-order related personality differences. Journal of Individual Psychology, 56(4), 481-494.
3. Leong, F. T. (2006). Birth order and the need for cognition. Journal of Genetic Psychology, 167(2), 221-225.
4. Rohde, P. A., Atzwanger, K., Butovskaya, M., Lampert, A., Mysterud, I., Sanchez-Andres, A., & Sulloway, F. J. (2015). Perceived parental favoritism and the need for cognition. Journal of Biosocial Science, 47(1), 1-17.
5. Scott, S. G., & Bruce, R. A. (1995). Decision-making style: The development and assessment of a new measure. Educational and Psychological Measurement, 55(5), 818-831.
6. Schwarzer, R., & Jerusalem, M. (1995). Generalized Self-Efficacy scale. In J. Weinman, S. Wright, & M. Johnston (Eds.), Measures in health psychology: A user’s portfolio. Causal and control beliefs (pp. 35-37). NFER-NELSON.
7. Sulloway, F. J. (1996). Born to rebel: Birth order, family dynamics, and creative lives. Pantheon Books.