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Concepts of Prevention To prevent drug abuse, the central question is: What individual and group factors need to be considered in designing interventions to be effec- tive? To answer that question, a series of related questions have been investigated: What elements affect the probability of onset, progression, severity, and cessation of drug use, abuse, and dependence? By what mechanisms do these factors work, in what combinations, and with what degrees of strength or determinacy? What interventions can be used to subject these probabilistic factors to preventive change? INTRODUCTION The research in this field has had to cope with great complexity, involv- ing multiple causal and conditioning pathways and factors that are influen- tial in some populations or environments but that appear far less salient in others. In trying to untangle this complexity, research has followed a num- ber of paths, some of which were ultimately abandoned as unfruitful. Over time, the field has increasingly become oriented to a few systematic ap- proaches that have survived tests of theoretical coherence and empirical plausibility. Although these approaches are not antagonistic or contradic- tory, they differ dramatically in emphasis. A more encompassing synthesis or integration of approaches is not realistically in view. Nevertheless, an overarching, three-part conceptual framework is helpful in understanding the current approaches, and it provides a good basis for considering their differences and commonalities. We refer to three general concepts as pre- disposing, enabling, and reinforcing elements. 45

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46 PREVENTING DRUG ABUSE: WHAT DO WE KNOW? Predisposing elements, the first part of the framework, are comprised of internalized individual characteristics (also called diatheses) and environ- mental exposures (conditions). Predisposing elements are in effect prior to the first encounter or opportunity to try illicit drugs. Predispositional logic holds that some subsets of individuals, by virtue of factors that they have acquired or been exposed to, are more vulnerable or more resistant to drug use, abuse, or dependence than individuals without such factors, or with less of them, all other things being equal. Potential predisposing elements may be genetically transmitted vulnerability in the form of certain temperamental or physiological characteristics; developmental deficits, such as failures in early socialization or a lack of self-esteem, which imply that interaction within the family is an important locus of concern; knowledge and beliefs concerning the hazards of drugs; the individual's own perceptions of a drug's ability to harm; moral beliefs and attitudes about drug consumption; or the individual's so- cial circumstances and prospects irrespective of family interaction. Second are enabling elements. These are decision-making and eco- nomic or other circumstances relating directly to individual behavior in the situation of opportunity to consume a drug. The major enablers are of two kinds: (1) the availability and accessibility of drugs and prevention or treatment resources in the community and (2) the individual's skills to de- fine and respond autonomously and effectively to problem situations such as the ones that drug availability presents. Knowledge or belief structures, self-perceptions, and skills may be transmitted interpersonally or through mass media. The distribution of both predispos- ing and enabling elements tends to be associated with socioeconomic class and ethnicity. The relationship of predisposing and enabling elements may be critical to understanding why the rates of onset of drug use may be similar in different groups but then diverge into sharply different rates of drug abuse and dependence. Third are reinforcing elements, which are the environmental (especially social and economic) contingencies that attach to drug-related behavior. Reinforcement may result from social recognition by a significant other or members of an important reference group, in the form of giving or with- holding approval (praise, prestige, esteem), disapproval (complaint, ridi- cule, or dislike), or intimacy; or earning money or acquiring property as a result of drug-related income. Major significant others and groups include parents (whose influence declines over time), peers (whose influence in- creases from childhood to adolescence); teachers; and job supervisors and coworkers (including military peers and superiors). Parents may retain greater influence than peers in some families. Like enabling elements, social reinforcers are distributed differently in different socioeconomic classes, ethnic groups, and residential zones (Green and Kreuter, 1991; Gottlieb and Green, 1987; Heckler, 1985; Jacob, 1987; Thomas, 1990~.

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CONCEPTS OF PREVENTION 47 There are four major conceptual approaches to prevention: risk-factor, developmental, social influence, and community-specific. We briefly de- fine each of these approaches in the next few pages. We then proceed in the balance of the chapter to present a more thorough review of the respective literatures of the first three approaches. Since the community-specific ap- proach is still largely outside the drug prevention research literature, we defer discussion of this approach to the appendix. The Risk Factor Approach Three major schools of thinking and associated research about preven- tion emphasize one or more of these concepts of predisposing, enabling, and reinforcing elements. The first school speaks principally in terms of risk factors, a concept that is used extensively in the epidemiology of car- diovascular, cancer, and other chronic diseases (Bry et al., 1982; Newcomb et al., 1987~. This is the most comprehensive approach in terms of the range and number of factors considered; it is also the least theoretically structured and the least empirically focused. A risk factor is any observable (measurable) characteristic of the indi- vidual (including duration of exposure to specified environmental condi- tions) that has been shown to correlate significantly (in population or case- control studies) with a criterion behavior or outcome in this case, with the onset of illicit drug use, some threshold level of consumption, or the clini- cal occurrence of drug abuse or dependence. This specification makes the risk factor model more empirical than theoretical. The risk factor must precede or at least occur simultaneously with the drug behavior; that is, a risk factor must be a potential cause or precursor, not a direct or indirect effect or symptom, of the criterion behavior. Reciprocal causation between risk factors and criterion behaviors is not precluded; in fact, as discussed below, a mutually reinforcing feedback among problem behaviors is the common pattern. For example, the desire for peer approval may predispose a teenager to try marijuana with her friends, the reduced inhibition and the relaxation felt during use reinforces the behavior and predisposes her to another opportunity to use. Most of the risk factors studied, in terms of the conceptual framework just reviewed, count as predisposing elements. Interventions to prevent drug use following the risk factor approach tend to emphasize educational approaches to modify self-esteem, specific beliefs and attitudes concerning drug use, and related predisposing factors (Bry et al., 1982; Newcomb et al., 1987~. Risk factors are statistical or probabilistic: if an individual "has" the factor, his or her odds (that is, statistical risk) of having the outcome are higher than if the individual does not have the factor, all other things being equal. For example, if John thinks marijuana is harmless, then the odds that he will try it are higher than

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48 PREVENTING DRUG ABUSE: WHAT DO WE KNOW? if he thinks marijuana can hurt him. Risk factors are usually additive: that is, risks add up; the more of them that apply, the more probable it is that the criterion outcome "at risk" will be observed. Some risk factors are easier to change than others, and some risk factors may weigh more heavily (higher zero-order or partial correlations with the criterion) than others. Those that meet both of these criteria become more strategic targets for intervention. Some risks may interact or have "synergistic" effects, in which one factor statistically multiplies rather than simply adds to the effect of other factors; in other words, a may be a nonsignificant risk factor, b may be a nonsignificant risk factor, but a and b together may be a formidably sig- nificant risk factor. Thus, although a may be a significant risk factor, in the absence of b, its effect on drug use is minimal. An open question is whether risk factors are generic (i.e., to many drugs) or specific (to each drug family). The Developmental Approach The second school of thought about prevention is based on developmen- tal theory. This approach particularly emphasizes the character and dynam- ics of interaction over time within the family during early childhood and within environments such as the school, especially grades 1-6. It shares with some risk factor theories a concern with early developmental deficits or predisposing factors. It differs, however, from risk factor theories in its heavy concentration on characteristics of the family and school environ- ment that directly reinforce undesirable patterns of affect, belief, or (most important) behavior. Conversely, it also concentrates on environmental re- inforcement of the development of positive motivation, educational poten- tial, and prosocial behavior. The developmental approach articulates a more elaborately linked and structured set of factors than risk factor approach. It has a more diffuse target, however; instead of trying to identify and focus on individuals who are "high risk" as the object of preemptive intervention, the developmental approach tends to bracket more inclusive populations and more dimensions of lifestyle or behavior (more than drug use, that is) as the loci of long-term environmental and institutional change. Social Influence Approaches The third major school of thought about prevention really a family of related approaches involves research on social influence. It is the most tightly focused theoretically, and it is population-based. Increasing atten- tion is being given in social influence research to variations among demo- graphic and other groups. It recognizes the important role of peers in the initiation and progression of drug use.

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CONCEPTS OF PREVENTION 49 The social influence model is based on four core components: (1) providing information on the negative social and short-term physiological consequences of smoking; (2) providing information on the social influ- ences to smoke- namely, peer, parents, and mass media; (3) correcting in- flated perceptions of smoking prevalence; and (4) training, modeling, re- hearsal, and reinforcement of methods to resist the social influences to smoke. Interventions largely concentrate on 6th through 10th grade students and are best known for aiming to prevent the onset of use by modifying enabling factors; in particular, increasing the knowledge of harmful effects and teaching specific resistance skills for resisting persuasive messages from peers and mass media. Cigarette smoking is the most thoroughly docu- mented health-related behavior in social influence theory, and most inter- ventions to increase resistance skills were originally developed and tested in the context of preventing the onset of smoking (Evans and Raines, 1982~. We have documented the relevance of smoking prevention to illicit drug use prevention in Chapter 1, in the discussion of gateway drugs and the se- quence of progression of drug involvement. An important variation on social influence approaches is the cognitive- behavioral model, which is based on the assumption that substance use results from the combined influences of social and psychological factors. Based on work by Schinke and colleagues on pregnancy prevention (Schinke and Gilchrest, 1977; Schinke, 1982), this approach has been adapted to smoking and other substances. The theoretical basis of the model is derived from both developmental and social learning theory. Alcohol and drug use is viewed as instrumental in meeting the developmental needs of youth (e.g., transition marker, reducing stress, peer group acceptance, establishing independence). The strategy for drug prevention emphasizes the develop- ment of enabling skills, the acquisition of decision-making and problem- solving skills to equip youth to make informed decisions about alcohol and drug use. The focus is on the development of cognitive, behavioral, and interpersonal skills. The approach is based on five core elements, which: deal with a wide range of problem situations through the use of a systematic problem-solving strategy, provide accurate information, teach coping strategies to relive stress and anxiety, develop assertiveness skills, and develop self-instructional techniques for behavioral self-control. A final important stream of work is the life skills approach, which emphasizes the development of general life and coping skills, in addition to skills and knowledge related more directly to resisting peer influences to use substances (Botvin et al., 1980; Botvin and Eng, 19801. The program

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so PREVENTING DRUG ABUSE: WHAT DO WE KNOW? focuses on teaching cognitive-behavioral skills that remedy psychological or behavioral deficits. The Life Skills Model program consists of three major components. A substance-specific component incorporates most of the information from the social influences approach. A second component addresses developing personal skills such as coping strategies, critical thinking, and decision-making skills and teaches the basic principles of behavior change. A third component develops social skills designed to improve interpersonal functioning. The Community-Specific Approach A fourth perspective attempts to encompass all of the prior three. We refer to this as the community-specific prevention approach. Community- specific prevention is receiving major attention in various fields of public health, particularly in preventing cigarette smoking and in controlling risk factors for cardiovascular disease, cancer, AIDS, teenage pregnancy, and other major health or related social problems. The conceptual foundations of drug abuse prevention historically have been imported from behavioral and social science research on cigarette smoking reduction and public health promotion generally. Large differences in the scale and nature of severe drug problems experienced in different communi- ties makes the community-specific approach seem especially applicable to drug abuse prevention, insofar as it is oriented to investigating population differences and community variations, and to mobilizing resources accord- ingly. The community-specific approach is, nevertheless, a barely culti- vated areas of drug abuse prevention research, within which the published work is not commensurate in scope with the risk-factor, developmental, and social-influence literatures. Therefore, we take this subject up in the appen- dix, which looks more generally to community-based health education to illuminate this important dimension. STUDIES OF RISK AND VULNERABILITY Much research attention has been focused on risk factors variables that exist before or during the typical age of onset of drug use (the second decade of life) and predict an elevated probability of developing abuse or dependence and on their mirror image, protective factors- those that seem to confer a degree of immunity against drug involvement. By and large, risk and protective factors are opposed ends of a set of continua, for ex- ample, impulsivity versus planning, strong versus weak family bonding (Jessor et al., 1992~. Risk and protective factors thus refer to relative degrees of vulnerability on a set of continua. Risk and protective factors may be characteristics of the individual or

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CONCEPTS OF PREVENTION 51 of the environment. Individuals vary greatly in physical and behavioral responses to nearly all health-related exposures or opportunities; they also vary in the environments to which they are exposed. The study of such variations and how they affect the probability of health problems has been immensely important in the history of medicine and public health, so it is no surprise that this approach has been adopted in the drug area (Rennert et al., 1986). A salient finding about patterns of drug consumption, discussed in the previous chapter, is the fact that a much larger number of individuals use drugs some very briefly, some intermittently over a longer span of years, some regularly but at a modest level that does not increase over time than the number who progress to the clinical status of abuse or dependence. The infrequent and/or low-dose use of drugs is not a matter of indifference, because such use is illegal and can have serious consequences. Any level of use generates a degree of risk of progression to abuse or dependence as a result of internal reinforcement, and use by some is likely to model or reinforce abuse and dependence by others. But by definition, the conse- quences of use are much less hazardous for the individual, on average, than the consequences of abuse and dependence. Although users outnumber drug dependent and abusing individuals, the smaller number of the latter incur the majority of the social costs of drug problems. It is therefore important to give particular attention to the degree to which particular causes increase the probability of abuse or dependence over and above the inci- dence of drug use per se. There are indications that the processes leading to use may be differen- tiated from those leading to abuse and dependence. In particular, unusually early onset of drug use (that is, well before the average age of onset in the population) is a strong correlate of later abuse or dependence, although this is not an infallible marker (Kandel et al., 1986~. The early onset of ciga- rette smoking is of special interest, and early alcohol and marijuana onset are also of concern, because these tend to be gateways to other drugs. Most studies of drug-related risk factors have been exploratory rather than substantive, that is, they have employed small samples, followed up for abbreviated periods, and have inadequate disaggregation and control for gender, race/ethnicity, and socioeconomic status. There are, however, a few studies large enough to establish with a certain degree of confidence the relative importance of key factors, including longitudinal studies conducted by a number of research teams, including: Judith Brook and colleagues (Brook et al., 1990~; Brunswick (1988~; Elliott and colleagues (Elliott et al., 1989~; Jessor and colleagues (Jessor and Jessor, 19771; Kandel and col- leagues (Kandel et al., 1986~; Kaplan and colleagues (Kaplan, 1985; Kaplan et al., 1988~; Kellam and colleagues (Kellam et al., 1983~; Newcomb and gentler (1988, 19891; Pandina and colleagues (Pandina et al., 1984; Labouvie

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52 PREVENTING DRUG ABUSE: WHAT DO WE KNOW? et al., in press); Pentz and colleagues (Pentz et al., 1986~; and others. The following discussions draw heavily on these studies. We first review some of the literature that has focused on single risk factors; the yield of this literature is rather low, so we have been highly selective in attempting to represent it, pointing out major conclusions of studies on the role of genetic and congenital factors, personality characteristics, and socioeconomic neigh- borhood characteristics. We then review the results of studies on multiple risk factors that focus attention on the issue of how these risk factors inter- relate. Genetic and Congenital Predispositions Since psychoactive drugs are chemical agents that work inside the body, it is natural to think that biological factors, including biologically heritable factors, play some part in promoting or inhibiting the onset of drug use, abuse, and dependence. The evidence for this hypothesis, however, was indirect and slender at the time of the committee's review for all drugs except alcohol. For alcohol, the heritability of some tendency heavily modulated by environmental and developmental features appears reason- ably well established. The evidence for biological risk factors is of two kinds. First, different strains of animal species bred for laboratory studies vary in their predilec- tion or resistance to consuming alcohol and other drugs, and these prefer- ences can be altered over generations through selective breeding. (These preferences can also be altered through training; trained behaviors are not, of course, genetically transmissible, although quickness in learning is.) Second, there is evidence from behavioral-genetic and related studies with human populations. Most of this work pertains to alcoholism, al- though there is evidence from other pharmacogenetic and genetic epidemio- logical research indicating predispositions to other types of drug abuse and dependence (Institute of Medicine, 1989; Pickens and Svikis, 1988; Pickens et al., 1991~. Family and twin studies suggest that there is a genetic predis- position toward one of two typical patterns of alcoholism. Children with a biological parent who has developed clinical alcoholism, even if this parent had no role whatsoever in their childrearing (e.g., children adopted at birth), are at four- to tenfold greater risk of this outcome compared with matched children whose biological parents are without a clinical history of alcohol- ism (Cloninger et al., 1981; Goodwin, 1983~. One index of risk that has not been well studied is the magnitude of dissonance among biological, cognitive, and behavioral spheres of function- ing during the early second decade. It has been observed that girls who enter puberty early may not yet be equipped with a number of social and cognitive skills commensurate with biological maturation. They may there

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CONCEPTS OF PREVENTION 53 fore be at increased risk for a number of adverse outcomes, perhaps for as long as a decade afterward, including drug and alcohol abuse, antisocial disorder, school dropout and unplanned pregnancy (Magnussen et al., 1986~. The age at menarche, as one biological marker of a host of anatomical, hormonal, and social changes, has been dropping steadily over the past 40 years, and social institutions have adjusted unevenly to these maturational developments. Overall, the place of biological heritage and biological mediation in explaining the onset of drug use, abuse, and dependence remains uncertain. Further human population research that attends as carefully to environmen- tal conditioning as to physiological measures is needed to evaluate the rela- tive role of neurochemical and other biological predisposing factors. A1- though it is premature to recommend trials of strategies for informing people of their possible risk based on family history of drug use, further analysis of the potential risks and benefits of such advice (e.g., the risks of labeling people and reduced self-esteem versus the benefits of reduced use of drugs) is justified in anticipation of improved biological markers of risk (Bamberg et al., 1990; Becker and Janz, 1987; Bensley, 1981; Childs, 1974; Hunt et al., 1986; Khowry et al., 1985; Zylke, 19873. Personality Characteristics Only a small number of the many personality characteristics that have been investigated in connection with drug use have shown significant re- sults as risk factors (Lang, 1983~. Among these few characteristics, the most positive evidence has accumulated in support of a psychological con- struct called sensation seeking. In contrast, such factors as depression, suicidal thoughts, and low self-esteem, all of which seem very plausible and often serve as commonsense assumptions underlying the design of drug abuse prevention efforts, do not stand up well under empirical investigation. Zuckerman (1979) described sensation seeking as a fundamental aspect of personality based in the neurochemistry of monamine oxidase. His four measures of sensation seeking seeking new experiences, seeking thrills or adventure, susceptibility to boredom, and disinhibition have been shown to correlate with a number of illicit activities, including alcohol and drug use, in adolescent and young adult populations (Bates et al., 1985; Huba et al., 1981~. In studies using the Rutgers longitudinal sample, sensation seek- ing and negative affectivity proved to have much larger effects on drug use, both independently and interactively, than positive affectivity. Newcomb and McGee (1989), using multivariate methods to probe results with the UCLA sample, found that sensation seeking had unexpectedly complex ef- fects, differing for males and females, with the most pronounced relation to high levels of alcohol use.

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54 PREVENTING DRUG ABUSE: WHAT DO WE KNOW? Many clinicians believe that specific emotional disorders, particularly depression and related distress, trigger or severely aggravate drug use, abuse, or dependence. The evidence in this direction is inconsistent. Kaplan (1985), Huba et al., (1986), Aneshensel and Huba (1983), and Labouvie (1986) all found that drug use is often preceded by emotional distress or depression. But the relieving effects of drug use on these states is short- lived. Newcomb and gentler (1988) found that alcohol use over time in a general population sample of adolescents was correlated with a reduction in depression, but no such correlation emerged linking other drug use to depression or other emotional distress. Elliott and Huizinga (1984) found that emotional problems and social isolation (feelings of loneliness) were moderately correlated with the level of use of alcohol, marijuana, and other illicit drugs in a general youth population sample. Dembo and col- leagues (1991) found a similar result among detainees in a juvenile deten- tion center. The most extreme level of depression is suicidal thinking and attempts. Suicide is the second leading cause of death among adolescents. However, drug use seems to be more a risk factor for suicide attempts than the other way around. Newcomb and gentler (1988) reported that adolescent use of "hard" drugs (beyond alcohol and marijuana) was associated with subse- quently increased suicidal thinking in young adulthood. The belief is widely held and intuitively appealing that a strong sense of self-esteem is a protective factor and lack of it a risk factor for adoles- cent drug use. There is no doubt that most cases of adolescent drug abuse or dependence that come to clinical attention are individuals who are short on self-esteem. The specific notion is that individuals with low self-esteem seek drugs in order to raise it (Kaplan, 19861. Numerous preventive inter- ventions have applied this theory by seeking to build up their participants' self-esteem, teaching them how to raise it, or expanding the opportunities for enhancing self-esteem in ways other than by taking drugs. Despite its attractions, the evidence for the self-esteem theory is mostly not supportive. In large studies such as White et al. (1986) and Kaplan et al. (1984), very weak correlations were observed between self-esteem and drug use, and these variables paled into insignificance under further statisti- cal manipulation. Even if self-esteem did seem to be an important risk factor for drug taking, the idea that it might be altered by any of the pro- gram measures ordinarily undertaken is problematic, denying or ignoring as it does commonly assumed determinants of self-esteem such as physical attractiveness (Simcha-Fagen et al., 19861. In summary, the search for specific personality risk factors for illicit drug taking has been mostly disappointing. Studies on sensation seeking, an active trait, have proven more promising than those focusing on more inward-turning characteristics such as depression and self-devaluation.

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CONCEPTS OF PREVENTION 55 Socioeconomic Factors at the Neighborhood Level The epidemiologic evidence indicates that onset of illicit drug use oc- curs mainly through peer group contact and that rates of onset (as distinct from continued use) are at rather similar levels within economic and ethnic groups. We suspect that the illicit drug use and trafficking that occur in economically disadvantaged communities, which are disproportionately black, Puerto Rican, and Mexican-American, occur for many of the same reasons as in other segments of the population, but that these reasons are more intense. In the most depressed portions of these communities, there is an additional dimension associated with greater numbers of drug abusing and dependent individuals and high levels of violence: namely, for many poor, young minority men and women, illicit drug markets are key sources of employment and are perceived as a route to economic mobility. In order to be successful in selling drugs, it is necessary for these young people to encourage drug use aggressively among the most vulnerable members of the community and to be prepared to enforce and protect their transactions in an increasingly gun-ridden and anarchic environment. As Brunswick (1988) notes in her longitudinal study of several hundred youths from central Harlem: "An often overlooked cornerstone of hard drug use among young black males is that it is not only and perhaps not primarily a consumption and/or recreational behavior. It also serves eco- nomic functions of occupation and career for this group" (see also Johnson et al., 1985; Preble and Casey, 1966; Williams and Kornblum, 1986~. In a population subgroup in which employment opportunities are severely con- strained, and at a life stage at which economic independence is expected and required, the drug economy is one of the relatively few high-wage options that seem wide open (Reuter et al., 1990~. It is not known with certainty what distinguishes those who sell drugs in economically disadvantaged communities from the majority of their peers in these areas who, with similarly limited opportunities, shun drug involve- ment, or from those in the middle who use but do not sell drugs. The perception and fact of being socially distant from mainstream opportunities, at the same time needing money in order to survive, are important. But, in every ethnic group in subcommunities dominated by drug use and sales, families are the most important social unit particularly so given the pau- city of institutional infrastructure in most economically impoverished areas. Although drug users in poor minority subcommunities are predominantly from single-parent, female-headed households, the same is true of those adolescents who do not use drugs (Fitzpatrick, 1990~. Whether or not there is an intact nuclear family, the most important family inhibitions against drug use (either through predisposition or through reinforcement) may be the active involvement of multiple adults in the immediate or extended

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CONCEPTS OF PREVENTION 65 least prevention of smoking onset as a dependent variable (Cornell and Turner, 1 985; Connell et al., 1 9851. Many programs are theory based, specifying which risk factors or me- diating variables they are trying to change and measuring whether these are in fact changed by program exposure. Studies of social influence interven- tion studies have measured changes in information, in specifically instructed interactive skills, and in native expectations regarding alcohol, tobacco, and drug use. MacKinnon et al. (1991) analyzed the first year of the Kan- sas City STAR program and found that a large share of the observed desir- able effects were best explained by changes in normative expectations among program-exposed youth. The fundamental work of Evans and colleagues (Evans, 1976; Evans et al. 1978, 1981) relied heavily on McGuire's (1964) "social inoculation" and "resistance to persuasive communication" theories for background. They drew most heavily, however, on Bandura's (1977, 1982, 1986) theories of social learning and his prescriptions for enhancing perceived self-efficacy: (1) specifying very explicit and proximal goals of training in this case, resistance skills; (2J promoting accomplishments of performance through participation and practice, (3) providing models of successful behavior in this case, peer models; and (4) providing task-specific feedback to reinforce and validate successful performance. The most fully developed, research-based, social-influence programs are cast from a single mold. Virtually all are based on a core of junior high or middle school classroom lessons given by regular teachers, trained "peer leaders," or specialized health educators. The curriculum runs through a sequence of modules attending to predisposing, enabling, and reinforcing factors, with central attention to the development of resistance behaviors against the initial opportunity to use drugs (tobacco, alcohol, or marijuana) in a peer group context. Ellickson et al. (1988:vi-vii) give a cogent sketch of a typical lesson plan, the 7th and 8th grade ALERT program: The first two lessons are intended to develop motivation to resist by sharp- ening students' perception of the seriousness of drug use and by revealing their personal susceptibility to the harmful effects of such use [predisposi- tional factors]. The next three lessons focus on resistance skills helping students to identify pressures to use drugs, counter prodrug messages and learn how to say "no" to both internal and external pressures Enabling factors]. The final three sessions reinforce the earlier content and clarify the benefits of resistance. During the eighth grade, students receive a three-session booster curriculum designed to reinforce resistance skills learned the previous year "reinforcing factors]. The curriculum provides multiple opportunities for student participation- role playing, question and answer techniques, small group activities, indi- vidual and group practice in saying "no," and written exercises.

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66 PREVENTING DRUG ABUSE: WHAT DO WE KNOW? There is some diversity among social influence researchers in how nar- rowly or broadly the programs are defined. Pentz et al. (1989) have pro- posed embedding the school-based curriculum within more comprehensive school and community efforts, for example, efforts to invigorate school antidrug policies and to mobilize community-wide awareness and support. Most of the research, however, has been focused on the curriculum compo- nent. There are differences here as well concerning the degree to which there is an emphasis on building general social competence or skills (such as assertiveness) in addition to ones targeted specifically at resisting peer- stimulated drug onset. This division between targeting proximal variables that will affect drug behavior but not (according to design) much else versus generic training that may have effects in many directions is characteristic of the larger school health education field, which has moved increasingly from categorical toward comprehensive programming (Green and Iverson, 1982; Kolbe and Iverson, 1983~. Research Needs A particular problem with social influence models is the implicit as- sumption that school-based influence encompasses all young people. The needs for recognition of many youths, especially economically disadvan- taged children in inner cities, are not well enough served by the schools to lead them to look to schools or even to their peers within the school frame- work for practical or moral instruction. These youths largely define them- selves by their street peer loyalties, not by school district lines. Peer influ- ences, as defined in research literature, are too often generalized as though all adolescents were culturally homogeneous; there is not enough research that recognizes the specific features of ethnic and street culture (Becker et al., 1989~. The foundations of social influence theory were in relatively small- scale social psychological studies, and more of these are needed now to extend our understanding of influence processes. More fundamental re- search is needed on small groups with a variety of youth-cultural affilia- tions. The careful studies in the l950s and 1960s of institutionalized street gangs, including attempts to change them, are a model worth recon . . SIC .erlIlg. SUMMARY Three principal approaches in drug abuse prevention research emerge from the recent past: the study of risk factors, the study of developmental sequences, and the study of social influence. It is helpful in seeing how these approaches relate to each other to note their differential emphasis on

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CONCEPTS OF PREVENTION 67 predisposing, enabling, and reinforcing elements or variables in the respec- tive theories and methods of inquiry. The risk factors under study include biological, personality, and socio- economic variables. In general, under longitudinal study, risk factors seem to operate as individually small but cumulative causes of criterion behav- iors. These studies generally suggest prevention strategies based on identi- fication of the high-risk youths, those for whom many such factors apply. Studies of risk factors are hobbled by measurement deficiencies with re- spect to environmental variables in particular, and methodological invest- ments and improvements in this respect are needed. The developmental approach involves a more structured, sequential model of poor early parenting, school maladjustment, academic deficiency, and gravitation toward school-oppositional groups, which are seedbeds of illicit drug use and other disorderly and problem behaviors. This approach incor- porates the general sense that there is a weakening of family bonds through- out the population and that primary schools, which may be more amenable to intervention particularly experimental intervention than family units, should be a key locus of study. The study of social influences, largely in junior high school popula- tions, has also been based on a highly structured theory derived from the concept of self-efficacy and its roots in social learning. While these theo- retical foundations have been extensively researched and appear robust in many ways, there has not been enough study of the differentiated social and normative world of early adolescence. This applies particularly to the emergence and significance of norms strongly antagonistic to schools and to the per- ception by adolescents of prodrug or antidrug norms in their peers. These are critical reinforcing environments that may make or break intervention strategies, so it is critical to build a more systematic understanding of them. REFERENCES Ames, C. in The enhancement of student motivation, In M.L. Maehr and D.A. Kleiber, eds., press Advances in Motivation and Achievement, Vol. 5. Greenwich, Conn.: JAI Press. Aneshensel, C.S., and G.J. Huba 1983 Depression, alcohol use, and smoking over one year: a four-wave longitudinal causal model. Journal of Abnormal Psychology 92:134-150. Bamberg, R., R.T. Acton, J.M. Roseman, R.C.P. Go, B.O. Barger, C.J. Vanichanan, and R.B. Copeland 1990 The effect of genetic risk information and health risk assessment on compliance with preventive behaviors. Health Education 21(2):26-32. Bandura, A. 1977 Social Learning Theory. Englewood Cliffs, N.J.: Prentice-Hall. Bandura, A. 1982 Self-efficacy mechanisms in human agency. American Psychologist 37:122-147.

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