Emotional intelligence (EI) is used in organizational training, coaching, and graduate schools. Despite its acceptance in practical applications, researchers continue to argue about its validity. EI can be defined “as a constellation of components from within a person that enable self-awareness of and management of his/her emotions, and to be aware of and manage the emotions of others.” EI seems to exist at the performance trait or ability, self-schema and trait, and behavioral levels. Based on this multilevel view, all the conceptualizations of EI and the different measures that result are EI. Research on the behavioral level of EI—its assessment, strengths, psychometric validity, and challenges—complements that on other approaches, which have already been the subject of many academic papers.