(54)A key function is a capacity to undertake particular governance tasks. IORPs should have sufficient capacity to have a risk-management function, an internal audit function and, where applicable, an actuarial function. Unless otherwise specified in this Directive, the identification of a particular key function should not prevent an IORP from freely deciding how to organise that key function in practice. This should not lead to unduly burdensome requirements because account should be taken of the size, nature, scale and complexity of the activities of the IORP.