"Commentators subdivide the issue of causation in a given case into two questions: the question of causation in fact - to be determined by the application of the 'but for' test - and the further question whether a defendant is in law responsible for damage which his or her negligence has played some part in producing: see, for example, Fleming, The Law of Torts, 7th ed (1987), pp 172-173; Hart and Honoré, Causation in the Law, 2nd ed (1985), p 110. It is said that, in determining this second question, considerations of policy have a prominent part to play, as do accepted value judgments: see Fleming, p 173. However, this approach to the issue of causation (a) places rather too much weight on the 'but for' test to the exclusion of the 'common sense' approach which the common law has always favoured; and (b) implies, or seems to imply, that value judgment has, or should have, no part to play in resolving causation as an issue of fact. As Dixon CJ, Fullagar and Kitto JJ remarked in Fitzgerald v Penn (1954) 91 CLR, at p 277 'it is all ultimately a matter of common sense' and '(i)n truth the conception in question (ie, causation) is not susceptible of reduction to a satisfactory formula'.