In today's competitive market, companies look for every advantage to be more efficient and with maximum customer satisfaction. For companies to achieve this, individual teams and employees must be highly successful. To form high-functioning teams it is important that each team member understands the team's goal, how it achieves this goal, and how team members interact. To understand how an individual behaves, various personality assessments have been developed. The purpose of this paper is to evaluate what the Myers-Briggs Type Indicator and the Big Five model of personality assessment are, why companies use these trait identifiers, and how using these indicators can improve the happiness of teams and employees . What are Personality Assessments Personality influences how and why employees behave the way they do, with this information it is important to know an employee's personality traits and what these traits may indicate. Both the Myers-Briggs Type Indicator® (MBTI®) and the Big Five model for personality assessment are popular based on their relative ease of use and time required to perform. The Myers-Briggs Type Indicator was first published in 1962 (MBTI Basics, n.d.). Since the first use of this indicator, employers have used the information obtained to determine a personality type. This personality type can help explain and predict how a person responds to interactions and circumstances with others (Robbins & Coulter, 2009). The 16 possible personality types described by the Myers-Briggs Indicator consist of four dimensions: social interaction, data collection preference, decision making preference, and decision making style. Each of these dimensions offers two people...... in the center of the card......A. & Langone, C.(n.d.). Jimmy Carter: Discovering the soul of a leader through the investigation of personality traits. Retrieved from http://www.leadershipeducators.org/Resources/Documents/Conferences/Memphis/manglelangone.pdfMoffa, M. (n.d.) A critique of the Myers Briggs Type Indicator (MBTI)—Part I: An expert review. Retrieved from http://www.recruiter.com/recruiting-news/critique-of-the-myers-briggs-type-indicator-critique/Robbins, S.P. & Coulter, M. (2009) Management (10th ed.). Upper Saddle River, NJ: Pearson Prentice HallThe JHM Consultancy. 2006. Introducing the Myers Briggs Type Indicator (MBTI). Retrieved from http://evaapp.typepad.com/iabcuk/files/introducting_the_mbti.pdfWatson, C. A. (2008). The relationship and differences between MBTI type, team skills, and perceived team success in virtual and traditional teams. Ann Arbor, MI: ProQuest LLC