Learning about personality types might be one of the best tools for self-improvement and improved relationships. By identifying personality type, we may be able to expand our strengths and strengthen our weaknesses. Additionally, assuming the personality type of your component in a relationship could greatly help strengthen the relationship by eliminating situations of disagreement and focusing more on shared common behaviors. These seem to be the main objectives which led several researchers specializing in psychology to carry out numerous experiments and studies of observation and analysis during most of the 19th century and up to the present day. Other specialized medical researchers have attempted to use certain classifications of personality types as indicators of health. Applying and assuming personality type concepts to certain relatives and close friends should not be difficult, but it would be very helpful or acceptable. There are several theories for classifying personality types based on different bases. The oldest was developed by the Ancient Greeks (Hippocrates 400 BC and Galen 140 AD) who classified four types of human humors based on the excess of one of the four bodily fluids (Neill, 2005). Another theory, developed by William Sheldon (1940), classifies people based on their physical fitness (Neill, 2005). The well-known theory of Carl Jung (1940), Katharine C. Briggs and her daughter Isabel Briggs Myers (1980) is probably the most widely used classification of personality types (BSM, 2006). This theory is based on individual preferences over four pairs of opposing fundamental human psychological functions. The first pair concerns how we prefer to motivate ourselves, internally (Introverted) or externally (Extroverted) (BSM, 2006). The second...... middle of paper...... puts people in boxes, or as an excuse for their unacceptable behavior. Knowing our personality type helps us understand why certain areas of life seem so easy and comfortable to us, while others are more difficult. Additionally, learning about other personality types helps us understand the most effective way to communicate with them and how they function best. Works cited by BSM Consulting of Golden, Colorado (March 28, 2006). Information about personality types. Retrieved from http://www .personali typage.com /info.htmlShrinivas K. (n,d). Personality Types AB CBuzzle.com, retrieved from http://www.buzzle.com/articles/personality-types-abc.htmlNeill J. (September 25, 2005) Personality Types. Retrieved 4/12/2010 from http://wil derdom .com /personali ty/L6-1PersonalityTy pes.html