The aim of this study was to evaluate the effectiveness of a brief motivational intervention to change processes against marijuana use in colombian youth through voluntary participation of 15 young people (eight men and seven women), aged between 18 and 23 years, expressing their desire not to continue consuming this substance. The study was conducted under a pre-experimental methodology, with pretest and posttest (M1 X M2) with a single group. For this case, the variations were measured in the psychological processes of change and the willingness to change in a group of 15 young marijuana after brief motivational intervention. Selective prevention program was implemented by the strategy workshop and allowed in each of the sessions follow a structured way strategies derived from TTM. The results indicate that the implementation of brief motivational intervention affected the motivational processes of change associated with marijuana, being effective for the selected sample; they cannot be generalized to the entire population, but contribute to the collection of research regarding the effectiveness of intervention Brief Motivational addiction.

The Health Belief Model, social learning theory (recently relabelled social cognitive theory), self-efficacy, and locus of control have all been applied with varying success to problems of explaining, predicting, and influencing behavior. Yet, there is conceptual confusion among researchers and practitioners about the interrelationships of these theories and variables. This article attempts to show how these explanatory factors may be related, and in so doing, posits a revised explanatory model which incorporates self-efficacy into the Health Belief Model. Specifically, self-efficacy is proposed as a separate independent variable along with the traditional health belief variables of perceived susceptibility, severity, benefits, and barriers. Incentive to behave (health motivation) is also a component of the model. Locus of control is not included explicitly because it is believed to be incorporated within other elements of the model. It is predicted that the new formulation will more fully account for health-related behavior than did earlier formulations, and will suggest more effective behavioral interventions than have hitherto been available to health educators.

The Health Belief Model was originally formulated to explain (preventive) health behavior. As defined by Kasl and Cobb,' health behavior is "any activity undertaken by a person who believes himself to be healthy for the purpose of preventing disease or detecting disease in a n asymptomatic stage." This is in contrast with illness behavior, defined as "any activity undertaken by a person who feels ill, for the purpose of defining the state of his health and of discovering suitable remedy," and sick-role behavior, "the activity undertaken by those who consider themselves ill for the purpose of getting well."The present paper is confined to the first of these areas -health behavior.I t should first be noted that the three modes of behavior are not discontinuous. Hardly anyone can be found who, upon intensive questioning, would report himself free of all symptoms. Similarly, the edges between illness behavior and sick-role behavior are blurred. Nevertheless, the distinctions are valuable because they refer to modal mental states which help to account for behavior. STUDIES OF HOW PEOPLE USE HEALTH SERVICESConsideration may first be given to the relationship between studies of how preventive health services are used and an understanding of why they are used. Do studies of how people use services explain why people use health services? I n approaching a n answer to this question, a careful distinction should be drawn between studies of utilization whose findings are intended to have immediate application and studies of utilization which are intended to serve as means to still other research ends. In the first case, information is sought to serve as a basis for formulating and implementing public policy in the health area. Utilization data obtained for such purposes have proved invaluable in the health Utilization studies undertaken as means to achieve the broader aim of increased understanding of why services are used, however, have generally failed to accomplish their purpose. Little can be learned from these studies about why people use or fail to use certain services. Evidence in support of this conclusion has been drawn from studies of

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