(31)A function is an administrative capacity to undertake particular governance tasks. The identification of a particular function does not prevent the undertaking from freely deciding how to organise that function in practice save where otherwise specified in this Directive. This should not lead to unduly burdensome requirements because account should be taken of the nature, scale and complexity of the operations of the undertaking. It should therefore be possible for those functions to be staffed by own staff, to rely on advice from outside experts or to be outsourced to experts within the limits set by this Directive.