After section 3
insert
(1) An "injury", in relation to a worker, is a physical or mental injury arising out of or in the course of the worker's employment and includes:
(a) a disease; and
(b) the aggravation, acceleration, exacerbation, recurrence or deterioration of a pre-existing injury or disease.
(2) Despite any other provision of this Act, a mental injury is not considered to be an injury for this Act if it is caused wholly or primarily by one or more of the following:
(a) management action taken on reasonable grounds and in a reasonable manner by or on behalf of the worker's employer;
(b) a decision of the worker's employer, on reasonable grounds, to take, or not to take, any management action;
(c) any expectation by the worker that any management action would, or would not, be taken or any decision made to take, or not to take, any management action.