"First, the reference in the definition in s 3(1) to 'a
decision of an administrative character made ... under
an enactment' indicates that a reviewable decision is a
decision which a statute requires or authorises rather
than merely a step taken in the course of reasoning on
the way to the making of the ultimate decision.
Secondly, the examples of decision listed in the
extended definition contained in s 3(2) are also
indicative of a decision having the character or quality
of finality, an outcome reflecting something in the
nature of a determination of an application, inquiry or
dispute or, in the words of Deane J, 'a determination
effectively resolving an actual substantive issue'.
Thirdly, s 3(3), in extending the concept of 'decision'
to include 'the making of a report or recommendation
before a decision is made in the exercise of a power',
to that extent qualifies the characteristic of finality.
Such a provision would have been unnecessary had the
Parliament intended that 'decision' comprehend every
decision, or every substantive decision, made in the
course of reaching a conclusive determination. Finally,
s 3(5) suggests that acts done preparatory to the making
of a 'decision' are not to be regarded as constituting
'decisions' for, if they were, there would be little, if
any, point in providing for judicial review of 'conduct'
as well as of a 'decision'."
(emphasis added).