Book excerpt: "An Introduction to Industrial-Organizational Psychology provides a brief introduction to Industrial-Organizational (I-O) psychology; a definition of the field; an explanation of the knowledge, skills, and abilities needed by master's level I-O practitioners; and a description of I-O master's professional practice areas. I-O graduate training is introduced, highlighting differences between master's training and doctoral training. The exponential growth of I-O master's programs over the past several decades and the growing demand in the job market for I-O practitioners is noted. The authors conclude with a discussion of issues relevant to the master's degree in I-O psychology"--