The Iowa Interview Questionnaire is a widely used assessment tool in the field of psychology and social sciences, particularly in the area of interpersonal relationships and communication. It is designed to gather comprehensive information about an individual's thoughts, feelings, behaviors, and experiences in various contexts. The questionnaire consists of a series of open-ended and closed-ended questions that aim to elicit specific information from the interviewee. Keywords: Iowa Interview Questionnaire, assessment tool, psychology, social sciences, interpersonal relationships, communication, comprehensive information, thoughts, feelings, behaviors, experiences, open-ended questions, closed-ended questions, interviewee. There are various types of Iowa Interview Questionnaires that have been developed over the years, each focusing on specific aspects or areas of interest. These variations include: 1. Iowa Parent–Child Interaction Rating Scale (PCI): This questionnaire primarily focuses on the parent-child relationship, evaluating the quality of interaction and communication between parents and their children. It aims to assess factors such as warmth, responsiveness, discipline techniques, and effective communication strategies implemented within the parent-child dead. 2. Iowa Gambling Task (IT): The IT is a psychological task used to assess decision-making abilities and risk-taking behavior. It involves a computerized card game where participants must make choices based on uncertain outcomes and immediate versus long-term gains. This questionnaire variant analyzes the individual's decision-making process and their ability to learn from feedback. 3. Iowa Personality Disorder Screen (IDs): This questionnaire is designed to screen for the presence of personality disorders. It includes an array of questions that investigate various personality traits, maladaptive behaviors, and dysfunctional patterns of thinking, aiming to provide an initial assessment of potential personality disorder symptoms. 4. Iowa Sleep Disturbances Questionnaire: This variation of the Iowa Interview Questionnaire focuses on sleep-related issues and disturbances. It covers areas such as sleep quality, sleep duration, insomnia symptoms, daytime sleepiness, and sleep-related behaviors. This assessment tool helps in understanding the individual's sleep patterns and identifying possible sleep disorders. 5. Iowa Social Support Inventory (ISSN): The ISSN focuses on assessing an individual's perceived social support system. It consists of questions that explore various dimensions of social support, such as emotional support, instrumental support, informational support, and appraisal support. This questionnaire aims to understand the level and quality of social support available to an individual. Overall, the Iowa Interview Questionnaire and its variants serve as valuable tools for researchers, clinicians, and professionals in gathering detailed information about individuals' thoughts, emotions, behaviors, relationships, and various aspects of their lives. These questionnaires provide a standardized approach to data collection, allowing for comparative analysis and in-depth insights into specific areas of interest.