The importance of finding and promoting the right employees in a workplace cannot be overstated. Companies invest significant amounts of time and resources into identifying suitable candidates to ensure long-term profitability and success. One approach commonly employed by organizations to aid in this process is the use of personality tests. This thesis explores the use of personality tests in the professional setting, specifically focusing on the Myers-Briggs Type Indicator (MBTI), the Big Five personality traits, the Enneagram, and Psychometric testing. The study investigates the interconnection of these tests and evaluates their effectiveness in promoting harmonious workplace relationships and improving productivity. The research also examines the controversies surrounding the use of personality tests, including concerns about discrimination in hiring practices. Additionally, the study investigates the relationship between personality traits and leadership styles, with a particular focus on transformational leadership, which is positively related to extroversion, openness, and conscientiousness. The findings suggest that personality tests can be an effective tool when used correctly and in conjunction with extensive research and facts. Ultimately, this thesis highlights the importance of identifying and promoting the right employees to ensure a productive and profitable workplace environment.