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88 Nw. U. L. Rev. 857 (1993-1994)
Functional Analysis of Criminal Law

handle is hein.journals/illlr88 and id is 873 raw text is: Copyright 1994 by Northwestern University, School of Law        Printed in U.S.A.
Northwestern University Law Review                                Vol. 88, No. 3
ARTICLES
A FUNCTIONAL ANALYSIS OF CRIMINAL LAW
Paul H. Robinson*
The criminal law has three primary functions. First, it must define
and announce the conduct that is prohibited (or required) by the crimi-
nal law. Such rules of conduct, as they have been called, provide ex
ante direction to members of the community as to the conduct that must
be avoided (or that must be performed) upon pain of criminal sanction.
This may be termed the rule articulation function of the doctrine. When
a violation of the rules of conduct occurs, the criminal law takes on a
different role. It must decide whether the violation merits criminal liabil-
ity. This second function, setting the minimum conditions for liability,
marks the shift from prohibition to adjudication.1 It typically assesses ex
post whether the violation is sufficiently blameworthy to warrant the
condemnation of conviction.'2 Finally, where liability is to be imposed,
criminal law doctrine must assess the relative seriousness of the offense,
usually a function of the relative blameworthiness of the offender. This
sets, in a general sense, the amount of punishment that is to be imposed.
While the first step in the adjudication process, the liability function, re-
quires a simple yes or no decision as to whether the minimum conditions
for liability are satisfied, this second step, the grading function, requires
judgments of degree. It must consider such factors as the relative
harmfulness of the violation and the level of culpability of the actor.
This Article argues that these three primary functions of criminal
law-rule articulation, liability assignment, and grading-are a useful
way in which to analyze and organize criminal law doctrine. Modem
criminal codes commonly acknowledge that criminal law serves each of
these three functions. However, these same codes fail to see that a given
code provision may serve one function but not another; the entire undif-
ferentiated code is seen as serving these functions together. The Model
* Professor of Law, Northwestern University. Earlier drafts of this Article benefitted from crit-
icisms by Ronald Allen, Andrew Ashworth, John Donohue, Antony Duff, Dennis Patterson, and
participants of law school faculty workshops at Northwestern University and New York University.
1 For a general discussion of the distinction between rules of conduct and principles of adjudica-
tion, see Paul H. Robinson, Rules of Conduct and Principles of Adjudication, 57 U. CH. L. REv. 729
(1990).
2 This is a Model Penal Code phrase. See, eg., MODEL PENAL CODE § 2.12(2) (1985).

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