The 4-H Study of Positive Youth Development (PYD), a longitudinal investigation of a diverse sample of 1,700 fifth graders and 1,117 of their parents, tests developmental contextual ideas linking PYD, youth contributions, and participation in community youth development (YD) programs, representing a key ecological asset. Using data from Wave 1 of the study, structural equation modeling procedures provided evidence for five first-order latent factors representing the "Five Cs" of PYD (competence, confidence, connection, character, and caring), and for their convergence on a second-order, PYD latent construct. A theoretical construct, youth "contribution," was also created and examined. Both PYD and YD program participation independently related to contribution. The importance of longitudinal analyses for extending the present results is discussed. 2The 4-H Study of Positive Youth Development (PYD) is a longitudinal investigation that seeks to identify the individual and ecological bases of healthy, positive development among diverse adolescents. Framed by an instance of developmental systems theory, developmental contextualism (Lerner, 2002(Lerner, , 2004, the 4-H Study is designed to follow youth across the second decade of life and to examine their developmental trajectories. This article describes the theoretical and methodological components of the study, and reports some key findings derived from the first wave of data collection (which occurred in 2002-2003).While we present the theoretical and empirical literature that legitimates the structural model and the design of the study, and in turn provide details about all features of the measurement model, we do not present analyses pertinent to all research questions, particularly since key facets of this model are optimally tested with change-sensitive data that will be available only through subsequent, longitudinal waves of the study. Instead, we present findings pertinent to the presence and structure of the several characteristics presently focused on in the literature as composing PYD (i.e., the Five "C"s of competence, confidence, character, connection, and caring) (e.g., Eccles & Gootman, 2002). We also propose a theoretical measure of youth contribution appropriate for early adolescents and examine unitemporal patterns of covariation with the 5Cs.Simply, before we could test with longitudinal data our developmental contextual conception of the process through which PYD occurs, we needed to establish that the concept of PYD as it had been discussed in the literature had empirical reality, both in its purposed structure and its covariation with other key individual and ecological variables 2 . Accordingly, we address the question of whether in the present data set there is evidence for the theoretical expectations that PYD is positively related to contribution and negatively related to adolescent risk and 3 problem behaviors and, as well, whether there is an association between PYD and youth participation in community-based, youth development (Y...

The positive youth development (PYD) perspective is a strength-based conception of adolescence. Derived from developmental systems theory, the perspective stressed that PYD emerges when the potential plasticity of human development is aligned with developmental assets. The research reported in this special issue, which is derived from collaborations among multiple university and community-based laboratories, reflects and extends past theory and research by documenting empirically (a) the usefulness of applying this strength-based view of adolescent development within diverse youth and communities; (b) the adequacy of conceptualizing PYD through Five Cs (competence, confidence, connection, character, and caring) ; (c) the individual and ecological developmental assets associated with PYD; and (d) implications for community programs and social policies pertinent to youth.A new, positive, and strength-based vision and vocabulary for discussing America's young people has been gaining momentum and is beginning to replace long-held beliefs of the inevitable so-called storm and stress of adolescence and the predictable engagement by youth in risky or destructive behaviors. When problems occur, they are viewed as only one instance of a theoretically larger array of outcomes that include the possibility of positive developments. From this perspective, youth are not broken, in need of

Using two randomly selected separate subsamples of 50,000 middle or high school students drawn from the 1999 to 2000 Search Institute Profiles of Student Life Attitudes and Behavior survey, first-and second-order factors of items assessing internal and external assets were identified. In both samples, first-order exploratory factor analyses produced 14 scales with conceptual integrity and adequate reliability, although differences were found between the middle and high school samples (e.g., further differentiation of scales). The factors in the middle school sample loaded on two second-order constructs, representing individual and ecological assets. These second-order factors accounted for unique variance in an index of thriving. The concept of developmental assets and the role of these assets in early adolescent development are discussed.

The search for genes of complex traits is aided by the availability of multiple quantitative phenotypes collected in geographically isolated populations. Here we provide rationale for a large-scale study of gene-environment interactions influencing brain and behavior and cardiovascular and metabolic health in adolescence, namely the Saguenay Youth Study (SYS). The SYS is a retrospective study of long-term consequences of prenatal exposure to maternal cigarette smoking (PEMCS) in which multiple quantitative phenotypes are acquired over five sessions (telephone interview, home, hospital, laboratory, and school). To facilitate the search for genes that modify an individual's response to an in utero environment (i.e. PEMCS), the study is family-based (adolescent sibships) and is carried out in a relatively geographically isolated population of the Saguenay Lac-Saint-Jean (SLSJ) region in Quebec, Canada. DNA is acquired in both biological parents and in adolescent siblings. A genome-wide scan will be carried out with sib-pair linkage analyses, and fine mapping of identified loci will be done with family-based association analyses. Adolescent sibships (12-18 years of age; two or more siblings per family) are recruited in high schools throughout the SLSJ region; only children of French-Canadian origin are included. Based on a telephone interview, potential participants are classified as exposed or nonexposed prenatally to maternal cigarette smoking; the two groups are matched for the level of maternal education and the attended school. A total of 500 adolescent participants in each group will be recruited and phenotyped. The following types of datasets are collected in all adolescent participants: (1) magnetic resonance images of brain, abdominal fat, and kidneys, (2) standardized and computer-based neuropsychological tests, (3) hospital-based cardiovascular, body-composition and metabolic assessments, and (4) questionnaire-derived measures (e.g. life habits such as eating and physical activity; drug, alcohol use and delinquency; psychiatric symptoms; personality; home and school environment; academic and vocational attitudes). Parents complete a medical questionnaire, home-environment questionnaire, a handedness questionnaire, and a questionnaire about their current alcohol and drug use, depression, anxiety, and current and past antisocial behavior. To date, we have fully phenotyped a total of 408 adolescent participants. Here we provide the description of the SYS and, using the initial sample, we present information on ascertainment, demographics of the exposed and nonexposed adolescents and their parents, and the initial MRI-based assessment of familiality in the brain size and the volumes of grey and white matter.

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