Evaluating the Influence of Birth Order on Personality

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Updated on Apr 17, 2013

Birth order is defined as a person's rank by age among his or her siblings. Studies indicate that family position can have a strong influence on a person’s personality. This experiment will evaluate this premise by looking for similarities in personality-type among first born, middle children, and last born participants.


Evaluate whether birth order influences personality.


  • Myers-Briggs personality test


  1. Find the Myers-Briggs personality assessment online and give to many different teenagers and/or adults.
  2. Record the birth order and Myers-Briggs personality type of each participant.
  3. Look for similarities or differences in the Myers-Briggs dichotomies (extroversion/introversion; sensing/intuition; thinking/feeling; judgment/perception) among first-born, middle children, and last-born participants.
Megan Doyle is a scientist, researcher, and writer based in Dallas, Texas. She received her Ph.D. after completing years of work in a laboratory and now focuses on writing about recent advances in the field of oncology. Always passionate about learning, Megan enjoys keeping up to date on breakthroughs in all fields of science.

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