Self-report measures play a central role in personality assessments, as they are the most common method for gathering information about an individual’s personality traits, characteristics, and preferences. In a self-report measure, individuals are asked to provide their own perceptions of their thoughts, feelings, behaviors, or attitudes in response to a series of items or questions. These responses are then used to generate scores or profiles reflecting various aspects of the individual’s personality. Self-report measures are widely used in personality assessments for several reasons: Ease of administration. Self-report measures are relatively easy and efficient to administer, as they can be completed by the individual without the need for specialized training or expertise on the part of the administrator. Flexibility. Self-report measures can be designed to assess a wide range of personality traits and characteristics, from broad dimensions such as the Big Five personality traits to more specific constructs like locus of control, learning styles, selling styles, teaching styles, leadership styles, communication styles, or coping styles. Accessibility. Self-report measures can be completed in various formats, such as paper-and-pencil questionnaires or online surveys, making them accessible to a diverse range of individuals and settings. Cost-effectiveness. Self-report measures are often more cost-effective than alternative assessment methods, such as interviews or behavioral observations, which can require more time, resources, and expertise to administer and interpret. Despite their advantages, self-report measures also have some limitations: Response bias. Self-report measures are susceptible to various forms of response bias, such as social desirability bias (i.e., the tendency to present oneself in a favorable light) or acquiescence bias (i.e., the tendency to agree with items regardless of their content). These biases can potentially compromise the accuracy and validity of the assessment results. Introspective ability. Self-report measures rely on an individual’s ability to accurately introspect and report on their own thoughts, feelings, and behaviors. Some individuals may have difficulty doing this accurately, either due to limited self-awareness or a lack of understanding of the constructs being assessed. Common method variance. Because self-report measures rely on a single source of information (i.e., the individual’s self-perceptions), they are susceptible to common method variance, which can inflate the relationships between different constructs or variables assessed by the same measure. Despite these limitations, self-report measures continue to play a crucial role in personality assessments due to their practical advantages and the valuable insights they can provide into an individual’s personality traits and characteristics. To address the potential limitations of self-report measures, researchers and practitioners may use additional sources of information, such as informant reports, behavioral observations, or alternative assessment methods, to obtain a more comprehensive and accurate understanding of an individual’s personality.