Selected issues related to the effectiveness of the communication process in the internal audit in organizations that have implemented the quality management system according to the PN-EN ISO 9001: 2015 standard have been presented in the article. The scope of the analysis includes both: verbal and non-verbal communication, focusing on interpersonal communication and aspects of psychology in communication processes (transactional analysis).
Keywords: internal audit; quality management system; effective communication; interpersonal communication; psychology in communication processes; transaction analysis