Written communication is an integral part of any organisation regardless of size or the nature of its business. The writer chooses words that should be understood by the readers. However, these words have been chosen based on a variety of factors, one of which is personality type, and the writer's personality type may differ from that of the readers. The research question underpinning this study is - In what ways, if at all, do personality types (as determined by the Myers-Briggs Type Indicator (MBTI) and most frequently found in management positions), select and use different words and phrases when writing business communication? To investigate this question, the psychological type theory of Jung, the personality type theory of Briggs and Myers, and organisational communication theory are applied. The methodology used is descriptive research with the documents analysed using content analysis, employing NUD.IST Vivo in conjunction with manual assessment. The research findings confirm that each personality type does use different words, validating personality type theory and therefore, making a contribution to the expanding body of research in this field. The knowledge gained from this study has significance in areas related to organisations as well as education and communication theory.