Psychologists study human behavior and mental processes by observing and recording how people relate to one another and their environment. They form hypotheses to explain their observations and apply their knowledge in a variety of fields like healthcare, education, law, and sports. Most psychologists require a graduate degree, such as a master's or PhD, and acceptance to graduate programs is highly competitive. Employment growth for psychologists is expected to be 11% for clinical, counseling, and school psychologists and 26% for industrial-organizational psychologists.