139TH INTERNATIONAL TRAINING COURSE
VISITING EXPERTS’ PAPERSSERIOUS AND VIOLENT JUVENILE OFFENDERS:ASSESSMENT AND TREATMENT
Robert D. Hoge*

I. INTRODUCTION
Many adolescents engage in risky rule-breaking behaviours. This may involve under-age drinking,cheating on a test, vandalism, or involvement in a physical fight. Minor legal infractions and rule breaking
are normative during adolescence. However, it is important to observe that the majority of young people do
not engage in serious criminal activity and are, in fact, responsible citizens.
On the other hand, a minority of youth engage in criminal acts serious enough to merit attention by
the police and judicial system. Most of these youth have not committed a serious crime and most do notcontinue to engage in criminal activities. However, a small group of young people commit serious crimes ofa non-violent (e.g., auto theft, drug trafficking) or violent (e.g., aggravated assault, rape) nature. Some will
only engage in these acts once, while others will exhibit a chronic pattern of offending.
The primary concern of this paper is with youth who commit serious criminal actions repeatedly,
whether of a violent or non-violent nature. We will examine some of the research on the characteristics ofthese young people and consider the available assessment and intervention strategies. We turn, first, though
to a closer look at the categories of youth we are interested in.

II. DEFINING SERIOUS AND VIOLENT CRIMINAL ACTS
Identifying criminal actions as serious and violent is sometimes complicated. Jurisdictions may differ
in the way in which individual actions are regarded. For example, cigarette smoking by children is treatedas a serious criminal act in Singapore but treated as a very minor transgression in other areas. Similarly, aphysical confrontation between two youth in the school may be treated as a serious criminal action in somejurisdictions but regarded as simply a disciplinary matter for the school to deal with in others.
However, non-violent criminal acts involving, for example, car theft, drug trafficking, and burglary arerecognized in most jurisdictions as serious. Similarly, violent actions such as homicide, aggravated assault,
rape, and robbery are almost always treated as serious violent crimes.
Some ambiguity is also associated with the identification of chronic serious criminal activity. There areno firm rules about the number or duration of criminal actions that define chronicity. Generally speaking,though, we are concerned with youth who engaged in repeated antisocial actions over a period of time.
We will not worry too much about these issues in definition. Our concern is with youth exhibiting apattern of repeated serious criminal activity or those at risk of this. We turn next to a brief overview ofdevelopments from theory and research on the causes of antisocial behaviours in youth.

III. IDENTIFYING PATTERNS OF SERIOUS AND CHRONIC CRIMINAL ACTIVITY
Research in developmental criminology has identified a number of relatively stable patterns or
trajectories of antisocial behaviour (see Arseneault, Tremblay, Boulerice, & Saucier, 2002; Frick, 2006;
Loeber, 1988; Moffitt, 2003, 2006). These patterns describe groups of individuals following similar paths in
the expression of criminal behaviours.
* Department of Psychology, Carleton University, Ottawa, Ontario, Canada.

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One of the paths is particularly relevant to our discussion of chronic criminal behaviour. The lifecourse-persistent pattern is characterized by youth who exhibit symptoms of a difficult temperament
during the early years, the appearance of various forms of conduct and oppositional disorders during thepreschool years, an escalation of the incidence and severity of antisocial actions during early childhood andadolescence, and the persistence of the antisocial behaviours into adulthood. These are individuals with along history of behavioural problems, and they constitute the majority of those we refer to as chronic serious
offenders. Their antisocial behaviours may be expressed in violent actions or as serious non-violent criminal
actions.
Caution needs to be observed with this pattern. Not all youth who exhibit an early difficult temperamentand serious conduct disorders during later childhood and adolescence will continue a life of criminal activity.
Some do manage to cease their antisocial life style by the time they reach the adult years. However, some do
not desist and will continue their criminal actions into adulthood.
The other major pattern identified in the research cited above is referred to as the adolescent-limited
trajectory . This is characterized by normal development during the childhood years and the more-or-lesssudden appearance of antisocial behaviours during adolescence. Youth exhibiting this pattern normally desist
from further criminal actions during later adolescence and the adult years. These are youth who suddenly
get into trouble during their teens but revert to a pro-social life style later on. Youth exhibiting this patternare of concern to us in the juvenile justice system, but they present a somewhat lesser challenge than those
who exhibit the life-course-persistent pattern.
These two patterns do not characterize all youth who engage in criminal activities. Some will not beginserious criminal activities until adolescence but will continue them into adulthood. Another pattern wesometimes observe involves persistent and chronic non-serious criminal activities. These are people who
never engage in serious criminal acts but who seem to have continual conflicts with the judicial system.
Our primary concern in this case is with the youth who seem at risk of life-course persistent criminal
activity, and we turn now to some research and theory relevant to explaining this phenomenon.

IV. SEARCHING FOR THE CAUSES OF SERIOUS CRIMINAL ACTIVITY
The fundamental challenge in the search for the causes of antisocial behaviours arises from thecomplexity of human behaviour. Many of the early theoretical positions regarding the causes of criminality
focused on a single causal variable, whether poverty, weak ego, deficient self-control, or the XXY
chromosome anomaly. These approaches were clearly inadequate. We now know that a wide range of factors
can influence the commission of a criminal act. Some of these are internal (e.g., aspects of temperament,social competencies, modes of perception) and some external (e.g., influences of parents and peers,
features of the immediate situation in which the action occurs). Further, these factors do not operate inisolation; rather, it is complex interactions among factors that have the causal impact. Further still, thedynamics of these factors are complicated. For example, individual predispositions relating, for example, toimpulsivity and aggressiveness, are likely the product of complex interactions among genetic, biological, andenvironmental influences.
A wide range of theories have been advanced to explain the commission of serious antisocial
acts, including those of a violent nature. The most satisfactory of the contemporary theories are thedevelopmental life-course theories incorporating a social learning theory perspective into a broad-based
integrative framework (see Andrews & Bonta, 2006; Guerra, Williams, Tolan, & Modecki, 2008a; Farrington,
2004; Rutter, 2003). Catalano and Hawkins’ (1996) Social Development Model is an example of thisapproach. It describes causal chains leading to the development of pro-social or antisocial life styles. The
theory incorporates a broad range of ecological and individual factors and tries to show how these operate
at different points in the developmental sequence. Boxer & Frick (2008) and Frick’s (2006) analysis of thefactors leading to a life-course-persistent pattern expressed in violent actions is an example of a recent
formulation focusing specifically on violence.

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139TH INTERNATIONAL TRAINING COURSE
VISITING EXPERTS’ PAPERS

This theoretical work is being supported by sophisticated research on the correlates and causes ofdelinquency. The most important research is based on prospective longitudinal designs involving the studyof the same individuals over a period of time, tracking changes in their behaviours, and exploring factors
associated with those changes.
The Cambridge Study in delinquent development is an example (Farrington, 1997, 2003, 2004;
Farrington, Coid, Harnett, Jolliffe, Soteriou, Turner, and West, 2006). The study was initiated in theearly 1960s with the collection of data from a group of 411 eight and nine-year old males drawn largely
from working class districts of London. The researchers are continuing to collect measures from theseparticipants who are now in their late forties. A wide variety of psychological measures have been employed,
including psychological tests, questionnaires completed by teachers and peers, and interviews conductedwith the participants and their parents. The incidence of criminal activity on the part of the participants
constitutes the primary outcome variable, and this has been measured through official records and selfreports. This research has yielded very important information about factors affecting the development ofantisocial behaviours.

V. RISK AND NEED FACTORS ASSOCIATED WITH SERIOUS AND VIOLENT CRIME
These theoretical and empirical developments are important in a number of respects, but it is theircontribution to the identification of risk and need factors associated with serious and violent crime that is ofprimary concern to us. A brief introduction to these terms is required. Risk factors refer to characteristics of
the youth or his or her circumstances associated with antisocial actions. Having a history of criminal activity,
coming from a dysfunctional home environment, friendship with antisocial peers, and aggressive tendencies
are examples. These factors place the youth at risk of continuing criminal activity. Need factors are risk
factors that can be changed, and, if changed, reduce the chances of future criminal activity. Improving parentchild relations and reducing associations with negative peers will, for example, reduce the probability ofcontinuing criminal activity.
We now have considerable information from the theoretical and research efforts cited above about risk
and need factors associated with serious and violent criminal activity. This work will be briefly reviewed
here, and you are referred to Hoge (2001), Loeber and Farrington (1998, 2000), and Rutter, Giller, & Hagell(1998) for further discussion of the factors.
Table 1 identifies the major categories of risk and need factors associated with serious and violent
criminal activity. It is the presence or absence of these factors that contribute to the likelihood the youth will
engage in serious antisocial acts or develop a pattern of criminal activity. They are divided in the table into
proximal factors that have a direct impact on the criminal action and distal factors that operate through theproximal factors.
Table 1: Major Risk/Need Factors

Proximal Factors
Antisocial attitudes, values, and beliefs
Dysfunctional parenting
Dysfunctional behaviour and personality traits
Poor school/vocational achievement
Antisocial peer associations
Substance abuse
Poor use of leisure time
Distal Factors
Criminal/psychiatric problems in family of origin
Family financial problems
Poor accommodations
Negative neighbourhood environments

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While all of these factors are likely relevant to the evolution of a life-course-persistent pattern expressedin violent behaviour, special attention should probably be paid to three factors when analysing a propensity ofviolent actions: a history of aggressive conduct disorders, certain personality and behavioural dispositions,and embracing antisocial attitudes and values.
Individuals who persistently engage in violent crimes generally have a history of serious conductdisorders. In fact, the research shows that a history of antisocial behaviour is the single best predictor of
future criminal activity. However, this does not represent a need factor since we cannot do anything about
history.
The second important factor relates to personality and behavioural dispositions. Youth who engage inserious and chronic crime often exhibit signs of impaired learning ability, poor self control expressed in
impulsivity, a propensity for risk taking, and high levels of aggressive emotions. These traits are common
among all youth who engage in criminal actions, but they are particularly pronounced in those exhibitinga life-course-persistent pattern involving violent actions. Some of these youth also exhibit a callous andunemotional type of orientation (Boxer & Frick, 2008; Frick, 2006). These are individuals who do not seem
capable of forming normal attachments with others and who lack a capacity for empathy. This characterizes
some of those engaging in the most serious violent crimes.
The third type of critical factor includes antisocial attitudes and values. This is reflected in negative
feelings about police, judges, teachers or anyone else in positions of authority. It is also reflected in
dysfunctional modes of perception and information processing. For example, many youth who engage inpersistent violent behaviours exhibit a tendency to perceive hostile intent in the actions of others evenwhen no such intentions are present.
Several cautions should be stated in interpreting the content of Table 1. First, individual factors do not
operate in isolation. For example, there is often a close link between poor parenting and associations with
antisocial peers. Second, the importance of these factors may vary with age level. For example, the qualityof parenting is likely a more important factor during late childhood than during adolescence. Third, while
this list of factors seems to apply across gender and culture, there may be differences among these groups
in the weighting of the factors and the way in which they impact the youth. For example, research suggeststhat girls may be more affected by a dysfunctional home environment than boys. Finally, it is important torecognize that strength or protective factors are as important as risk and need factors in describing theyouth. Even young people engaging in serious crime and displaying many risk factors may also possess
sources of strength that need to be recognized. The youth may have an interest in sports, or exceptional
abilities in an academic area, or a caring and co-operative parent. As we will see, these can often be used aspart of a treatment programme.

VI. IMPLICATIONS FOR ASSESSMENT AND TREATMENT
We now have considerable information from programme evaluation research about effective andineffective practices in the treatment of the juvenile offender (Andrews & Bonta, 2006; Guerra, Kim, &Boxer, 2008b; Hoge, 2001; Loeber & Farrington, 1998). Several of these principles are relevant to our
discussion. This research demonstrates that:
•
•
•
•
•
•
•

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Effective programmes use standardized assessment tools and procedures;
The risk principle of case classification is observed: high risk cases are provided intensive services,while lower risk cases receive less intensive services;
The need principle of case classification is observed: targets of service are matched with the specificneeds of the youth;
The responsivity principle of case classification is observed; interventions take account of individual
or circumstantial characteristics of the youth;
Interventions are structured and focused and are based where feasible on evidence-based
programmes;
Interventions are delivered in the community setting where feasible;
Interventions are multimodal; address the full range of needs of the youth.

139TH INTERNATIONAL TRAINING COURSE
VISITING EXPERTS’ PAPERS

There are some additional rules that, while not extensively researched, reflect the clinical experience ofprofessionals:•••

Goals and means of achievement are realistic for the youth;
Staff delivering services are selected with care and provided adequate training and support.
Staff take care to ensure that they represent pro-social models.

The following are brief discussions of some specific implications of these principles for the assessment
and treatment of serious and violent offenders.

A. Assessment
Assessment of the full range of characteristics and circumstances of the youth is critical to the successof any intervention effort (Hoge, 2008; Hoge & Andrews, 1996). Assessments will be used to ensure thatthe risk, need, and responsivity principles are applied in case planning. Practical guidelines in the conduct ofassessments were discussed in the first paper in this series. It was shown there that assessment tools must
demonstrate adequate levels of reliability and validity.
Full psychological assessments conducted by a mental health practitioner may be called for in the caseof very serious chronic offenders, particularly where there are indications of emotional disorder. These
assessments will generally involve standardized personality and intelligence tests as well as structured
interview procedures.
However, full psychological assessments are not required in all cases, and a number of structured
assessment tools for evaluating risk and need factors in youth engaged in serious and violent crimes areavailable for use by non-mental health professionals. This includes probation officers, youth workers, or staff
of institutional facilities. The instruments do require a background in child studies and special training in
administering, scoring, and interpreting the measures.
The Youth Level of Service/Case Management Inventory (YLS/CMI; Hoge, 2005; Hoge & Andrews,2002) is an example of a standardized actuarial measure providing estimates of risk for serious and violent
offending and a framework for developing case plans based on a risk/needs assessment. The risk/needs
section of the inventory contains 42 items reflecting characteristics of the youth (e.g., “truancy”, “chronic
drug use”) or his or her circumstances (e.g., “parent provides inadequate supervision”). The section yields
an overall risk/needs score and scores for the following domains: Prior and Current Offences/Dispositions;
Family Circumstances/Parenting, Education/Employment, Peer Relations, Substance Abuse, Leisure/
Recreation, Personality/Behaviour, and Attitudes/Orientation. An opportunity is also provided to indicate
areas of strength. Subsequent sections provide formats for developing a case plan based on the risk/needs
assessment. Reliability and validity research has been reported for the measure.
Other instruments in this category include the Early Assessment of Risk List for Boys (EARL–20B;
Augimeri, Koegl, Webster, & Levene, 2001); Structured Assessment of Violence Risk in Youth (SAVRY;
Bartel, Borum, & Forth, 2005); and the Washington State Juvenile Court Assessment (WSJCA; Barnoski,2004). Borum and Verhaagen, 2006 and Grisso, Vincent, and Seagrave (2005) have provided extended
discussions of these measures.

B. Treatment
Interventions with serious and violent juvenile offenders often involve purely punitive sanctions, with
incarceration in a correctional institution the most common response. However, research clearly shows that
punitive sanctions are generally ineffective in reducing criminal activities (Andrews & Bonta, 2006; Lipsey& Wilson, 1998). Effective interventions are based on the principles of best practice reviewed earlier in thepaper. That is, they adjust the intensity of the intervention to the risk level of the youth, direct interventions
at the specific needs of the youth, and take account of responsivity factors in selecting the intervention.
Further, where possible we will select standardized treatment programmes that have proven effective indealing with high risk youth (evidence-based programmes).
Research has shown that youth engaged in serious and violent criminal activities can exhibit a wide

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range of risk and need factors, some of them individual characteristics (e.g., impulsivity, substance abuse,educational failure) and some characteristics of their situation (e.g., poor parenting, lack of community
resources). However, it is individual characteristics relating to poor impulse control, attention deficits, highlevels of anger, antisocial attitudes, and defective social-cognitive information-processing that seem mostclosely related to the serious criminal activity.
A number of structured intervention programmes for dealing with these individual deficits have beendeveloped and for which some empirical support for efficacy is available. These are identified in Table 2. Itshould be clear, however, that applications of these programmes require the careful selection and training ofindividuals administering them.
Table 2: Examples of Evidence-Based Treatment Programmes

Anger Control Therapy
Aggression Replacement Training
Equip Program
BrainPower Program
Anger Coping Program
Gang Resistance Education and Training Program
Social Competence Promotion Program

VII. FINAL COMMENTS
The introduction of standardized assessment procedures and structured intervention programmes
requires financial resources. However, these should be regarded as investments rather than simply
expenses. The use of proven techniques and procedures can produce significant reductions in the criminal
activities of youth and this can represent meaningful savings in the legal and social costs associated withthose activities.

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VISITING EXPERTS’ PAPERSREFERENCES
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