In human resource management and industrial relations, why is it considered best practice to assign two managers to lead a workplace disciplinary investigation?

Principles of Natural Justice & Procedural Fairness: Assigning two managers (or a panel) to lead a disciplinary investigation ensures impartiality, objectivity, and balanced decision-making. Having more than one investigator reduces individual subjectivity, prevents personal bias or conflict of interest from influencing the outcome, and ensures that evidence and witness statements are evaluated accurately. Furthermore, one manager can focus on conducting the interview while the second takes detailed contemporary notes, preserving procedural integrity.