Moore-McQuillan v WorkCover SA

In *Moore-McQuillan v WorkCover SA*, the High Court of Australia considered an appeal concerning the interpretation of the *Workers Rehabilitation and Compensation Act 1986* (SA) (the Act). The dispute arose from a decision by WorkCover SA to reject a claim for compensation made by the appellant, Ms. Moore-McQuillan, who had suffered a psychological injury. The core of the disagreement lay in whether the injury was compensable under the Act, specifically in relation to the definition of "work injury" and the circumstances under which a psychological injury arising from a "dispute" at work would be excluded from compensation.

The High Court was required to determine two primary legal issues. Firstly, it had to ascertain the correct interpretation of section 3(1) of the Act, which defines a "work injury" and includes injuries arising from employment. Secondly, and crucially, the Court had to consider the application of section 3(4) of the Act, which provides that a "work injury" does not include a mental injury that is a consequence of, or is contributed to by, a dispute between the worker and their employer or a dispute between the worker and another employee, unless the dispute is of a kind that is not trivial.

The Court's reasoning focused on the statutory language of section 3(4). It held that the exclusion in section 3(4) was not confined to disputes that were solely about employment-related matters. Instead, the provision applied to any dispute between a worker and their employer or another employee, regardless of its subject matter, provided it was not trivial. The Court emphasised that the purpose of the exclusion was to prevent compensation for psychological harm arising from the inevitable interpersonal frictions and disagreements that occur in any workplace. Therefore, if the psychological injury suffered by Ms. Moore-McQuillan was a consequence of, or contributed to by, a dispute with a colleague that was not trivial, it would fall within the exclusion and not be compensable.

The High Court allowed the appeal, setting aside the order of the Full Court of the Supreme Court of South Australia and remitting the matter to the South Australian Employment Tribunal for determination according to law.