Pediatric Exercise Science, 1993,5 , 263-274 0 1993 Human Kinetics Publishers, Inc. Sources of Information Underlying Personal Ability Judgments in High School Athletes Thelma S. Horn, Susan D. Glenn, and Amy B. Wentzell This study was conducted to test whether there are age and gender differences in the criteria that high school athletes use to evaluate their ability in sport contexts. To test this issue, 435 high school athletes from a variety of sports were administered the Sport Competence Information Questionnaire which provides a measure of preference for 10 competence information sources. A 2 x 2 (Gender x Age Level) MANOVA revealed that older adolescents were more apt to use self-comparison/intemalinformation,goal achievement, and sport attractionlenjoyment to judge their sport ability while younger athletes were more dependent on the evaluation of peers. In addition, females scored higher than males on the use of self-comparison/intemalinformation and on evaluative feedback from significant others. In contrast, males scored higher on the use of competitive outcomes and speedlease of learning to evaluate personal sport competence. The results indicate that high school athletes do vary in the sources of information they use to judge their sport competence, and that gender and age can account for a significant amount of that variation. In the past couple of decades a number of theories have been developed to explain differences between children in their achievement motivation (e.g., 2, 6,9). Although these theories differ from each other in several ways, all of them emphasize perceived ability as an important construct in understanding children's achievement behavior. Generally these theories hypothesize that children who have high perceptions of their ability in a particular achievement domain will be more motivated to participate in activities in that domain, will work hard to achieve competence, and will enjoy their participation. In contrast, children who have low perceptions of their ability will exhibit low motivation, lack of persistence, and considerably lower enjoyment when working in such a domain. Given the importance of perceived ability, a few researchers have begun examining how children form perceptions of their competence in particular achievement contexts. These researchers have attempted to identify the particular types of information children use to judge whether they are good or not so good Thelma S. Hom and Amy B. Wentzell are with the Dept. of Physical Education, Health and Sport Studies at Miami University, Oxford, OH 45056. Susan D. Glenn is with the Dept. of Exercise and Movement Science at the University of Oregon, Eugene, OR 97403. 264 - Horn, Glenn, and Wentzell in a particular achievement activity. Although there are many potential sources of information in any achievement domain that children can use to judge their ability, the research suggests that these sources vary as a function of age. In the academic domain, for example, Stipek and MacIver (17) reviewed the empirical research to conclude that the information children use to assess their intellectual abilities shifts over the elementary school years from an emphasis on effort, evaluative feedback from adults, and simple task mastery to an emphasis on peer comparison, performance outcomes (grades), and across-domain comparisons. Thus the information children use to evaluate or assess their academic ability appears to follow a developmental pattern. In the sport domain as well, Horn and colleagues (10, 12) have found a developmental pattern with regard to the sources of information that children use to judge their sport or physical competence. Their results indicated that children between the ages of 8 and 14 years show a relative decline in the use of evaluative feedback from significant adults, especially parents, and an increase in the use of peer comparison (i.e., comparing own performance with that of peers) and peer evaluation (i.e., evaluative feedback from peers) to judge personal competence. These results again suggest that the criteria children use to evaluate their sport ability changes across the childhood years. In contrast to the number of studies conducted with children in the elementary and middle school years, very little research has been done to examine the criteria used by adolescents to evaluate their sport competence. Given the number and intensity of physical, psychological, and emotional changes that occur during these years, it would seem reasonable to believe there would also be changes in the way younger and older adolescents evaluate their sport ability. Thus the purpose of this study was to examine the criteria used by male and female athletes who ranged from 14 to 18 years of age. Although this was essentially an exploratory study due to the fact that the sources of sport ability information had never been examined in this age group, the related literature in both the sport and nonsport areas was reviewed to identify some tentative hypotheses concerning possible age and gender differences in competence criteria. In regard to potential age differences, it was hypothesized that from early to late adolescence children would show a decrease in dependence on such external sources of information as peer comparison, peer evaluation, and winPoss outcomes and a comparable increase in the use of self-determined or internalized standards of performance. This hypothesis is based on research and theory from the developmental psychology literature (3, 9, 19) showing that children over the adolescent years develop or internalize a set of personal standards and/or values that can then be used to evaluate their own performance and behavior in subsequent achievement situations. Support for this developmental phenomenon in the sport setting was demonstrated in a recent study conducted by Vealey and Campbell (18) with a sample of 103 elite figure skaters ranging in age from 13 to 18 years. Correlational analyses showed that age was positively related to athletes' tendencies to base performance satisfaction and feelings of competence on performing well, and negatively related to their tendencies to base satisfaction and feelings of personal competence on winning. In regard to gender differences, the research by Horn and colleagues (10, 12) with younger children 8 to 14 years has shown no differences in the type of information used by boys and girls to judge their sport competence. However, Sources of Information - 265 based on research in the developmental psychology literature (14, 15, 16) which suggests that gender differences in many psychological variables may either first emerge or intensify during the adolescent period, it was anticipated that gender differences would be evident in this study. Specifically, it was hypothesized that female athletes would rely more on skill improvement, goal achievement, and other more internal sources of information to evaluate their sport ability while males would rely more on peer comparison and performance outcomes (i.e., win/loss records and game performance statistics). This hypothesis was based on related research in the sport psychology area which has shown consistent gender differences in achievement orientation. Gill (8) and her colleagues, for example, in their research with high school and college subjects on sport achievement orientation, have consistently found that males score higher than females on competitiveness and on win orientation. In contrast, females score higher than males on goal orientation, that is, an emphasis on achieving personal goals in competitive sport. Duda (4,5), working from a goal perspective theory, has also found gender differences in the sport cognitions of adolescent athletes. Specifically, female athletes scored higher in task orientation (emphasis on skill improvement) while males scored higher in ego orientation (emphasis on demonstrating more ability than relevant peers). In an interesting and related study on gender differences in the antecedents of state (pregame) anxiety and self-confidenceof university-level athletes, Jones et al. (13) found that females' pregame cognitive anxiety and self-confidence could best be predicted by their perceptions of mental and physical readiness and perceptions of match importance. However, males' pregame anxiety and self-confidence were most highly associated with their perceptions of the team's ability to win and their rating of the other team's ability. These results suggest that male and female athletes do differ in the factors that affect pregame levels of state anxiety and self-confidence. Finally, in a study conducted to examine the sources of information used by adult participants to judge their performance in exercise contexts, Ebbeck (7) found significant differences between men and women. Specifically, male exercisers appeared to rely more on external information such as peer feedback while females indicated greater use of self-referenced information such as goal achievement, personal effort, or skill improvement to judge how successful they were in the exercise setting. The combined results of the research cited above served as the basis for the study hypotheses expressed earlier concerning gender differences in sources of competence information. These hypotheses, combined with those based on the developmental literature, were tested via a questionnaire study with high school athletes. Methods Subjects and instrumentation The subjects for this study included 435 high school athletes ranging in age from 14 to 18 years, who were attending a summer sport camp at a midwestern university. This subject sample included 264 males (M age = 16.02 k.91) and 266 - Horn, Glenn, and Wentzell 171 females (M age = 15.78 k.82). These athletes were in Grades 9 through 12 and represented a variety of sports including basketball, volleyball, tennis, soccer, and ice hockey. omplete a 39-item questionnaire designed to All subjects assess what sources of information adolescents use to judge their sport ability. This Sport Competence Information questionnaire begins with a short narrative concerning the use of competence judgments in high school sport situations (see Figure 1). This narrative is followed by a list of 13 items describing the various sources of information available in the sport context and which athletes could use in judging their sport competence: parental feedback, coach feedback, peer feedback, peer comparison, speed or ease of learning, amount of effort exerted in practices and games, attraction toward or liking for sport, game performance statistics, game outcome (winfloss),internal information (e.g., anxiety, self-confidence), degree of skill improvement over time, spectator feedback, and achievement of self-set goals. Subjects are asked to rate on a scale of 1 to 5 how important each source of information is to them in evaluating personal sport competence. The complete questionnaire contains three narrative sets, each of which assesses the subjects' use of the 13 sources of information. Sources of Competence Information Some high school athletes are pretty confident over most of the season that they are having a good year in their sport. Other athletes doubt from time to time whether they are having a good year in their sport. Listed below are a series of items which represent sources of information that a high school athlete might use in judging how well she or he is doing over the season. Please rate each source of information as to how important it is to you in helping you know over the season whether you are doing well or not so well 1. How easy it is for me to learn a new skill or play 2. The praisefcriticism I get 3. How confident or unsure I am before and during games 4. Whether or not I am performing the way I expected myself to perform 5. What my parents say to me Sources of Information - 267 The 39 items included in the Sport Competence Information questionnaire were selected based on (a) previous research concerning competence judgments in younger athletes (10, 12), (b) a review of the adolescent literature, and (c) a pilot questionnaire that was administered to 107 male and female high school athletes from a variety of sports. Study Procedures Questionnaires were administered in a group setting to all subjects during a rest break after a morning, afternoon, or evening practice session. The questionnaires were administered in the practice environment either by the principal investigator or by trained research assistants and took the subjects approximately 20 to 25 minutes to complete. Informed consent was obtained prior to subjects' participation in the study. Results Factor Analysis of the Questionnaire Due to the exploratory nature of this study, the 39-item questionnaire measuring subjects' preferences for particular sources of competence information was subjected to a principal-axis factor analysis. This was deemed necessary in order to determine whether the 13 information sources assessed in this study would actually be representative of a smaller number of more general latent constructs. Initial factors in this analysis were extracted using a minimum eigenvalue of 1.0, and the results of both orthogonal (varimax) and oblique (oblimin) rotations were examined. Because the factor structures obtained from both rotations were similar, and all correlations between factors in the oblique rotation were low, the orthogonal results were selected for further analyses. The factor analysis resulted in a 10-factor solution. A minimal loading of .40 was used as a criterion value in the interpretation of individual factors. Examination of the factor weights (see Table I ) indicated that each factor was rather easily interpreted and represented a conceptually meaningful source of competence information. Thus it appeared that the 13 original sources of information could be reduced to a more parsimonious and conceptually more integrated list of the sources of information used by adolescent athletes to judge their sport ability. As shown in Table 1, items loading highly on Factor 1 represent the use of self-comparison information (i.e., skill improvement over time) combined with such internal information as self-confidence, self-motivation, degree of exerted effort, and personal expectations to evaluate personal competence. Thus this factor was labeled self-comparison/internal information. Factor 2, competitive outcomes, reflects the use of game or match outcome (winning or losing) and personal performance statistics to judge competence. Factor 3, parental evaluation/feedback, indicates dependence upon evaluative feedback from parents. Items loading high on Factor 4, peer comparison, show a use of peers' performance to judge own competence. Factors 5, spectator evaluation, and 6, coach evaluation/feedback, represent the use of evaluative feedback from significant others in the sport environment. Factor 7, speedlease of learning, suggests dependence on the speed or ease with 268 - Horn, Glenn, and Wentzell Table 1 Factor Analysis Results: Sources of Competence lnformation Factor weights Information sources Skill improvement over time Willingness to work in practice Ability to improve skills Ability to motivate self Improvement from last season 1 2 3 4 5 6 7 8 9 1 0 .55 .03 .01 .10 .08 .08 .15 .09 .10 .16 .68 .OO .08 .03-.01 .08 .03 .06-.02 .08 .63 .12 .07 .03-.01 -.05 .16 .05 .06 .01 .60 .OO .07 .05 .01 .14 .ll -.01 -.02 .07 .53 .02-.03 .08 .13 .13 .09 .08 .24 .14 Good feeling after practices .44 -.05 .18 .19 .10 .09-.07 .04 .ll .13 .49 .08 .OO .27 .10 .06-.01 .07 .17 .02 Performing up to my expectations .43 .10 .08 .04-.01 .09 .22 .06 .12 .09 Effort needed to maintain skill Self-confidence before games .49 .I4 .05 .13-.02 .08 .16-.06 .20 .05 Personallteam winnoss record .09 .79 .13 .11 .10 .01 .18 .09 .O1 .ll Personallteamwinlloss record .06 .86 .ll .08 .15 .03 .17 .07 .06 .09 Winlloss of important games .16 .63 .05 .14 .15 .15 .16-.04 .01 .02 Personal game statistics .06 .45 .10 .36 .14 .02-.03 .08 .14 .06 Parents' evaluation or feedback .12 .ll .80-.05 .08 .05 .03 .09 .04 .05 Parents' judgment of my ability .12 .13 .86 .09 .10 .06 .10 .10 .04 .08 Parents' comments after game .12 .ll .83 .ll .18 .ll .06 .03 .02 .05 Comparison to teammates in games .ll .09 .07 .62 .07 .03 .19 .16 .03-.lo Quality of play in games .28 .10-.03 .42 .14 .01 .ll .03-.01 .08 Comparison to teammates in practice .21 .17 .09 .58 .12 .12 .20 .30 .06 .OO General comparison to teammates .12 .13 .OO .59 .13 .ll .08 .I 1 .OO .02 Spectators' judgments .14 .26 .22 .17 .62-.05 .14 .20-.04 -.01 Evaluation from fans and media .09 .18 .08 .23 .69 .08 .07 .30 .01 .03 Spectators' reactions .05 .18 .18 .18 .79 .08 .10 .14-.01 .OO Coaches' comments .I0 .02 .12-.03-.03 .71 .09 .16 .I0 .05 Coaches' evaluation .24 .08 .03 .10-.02 .71 .09 .10 .12 .04 Praise or criticism from coach .09 .06 .05 .13 .12 .67 .02 .09 .02 .04 Speed of learning new skills .26 .17 .07 .19 .10 .09 .57 .10 .09 .03 Time ta leam .29 .18 .07 .22 .12 .06 .67 .07 .04 .11 Ease of learning .24 .16 .05 .ll .13 .16 .63 .21 .05 .ll Peers' evaluation .06 -.01 .09 .10 .15 .05 .09 .63 .07 .OO Teammates' evaluation .06 .07 .08 .20 .18 .24 .ll .70-.05 .05 Teammates' judgments .13 .14 .06 .29 .19 .22 .09 .56 .01 .04 Achievement of self-set goals .34 .10-.01 .07-.lo .14 .08 .04 .62 .06 .35 .10 .12 .03-.05 .12 .10 .O1 .78 .08 Reaching preseason goals .29 .12 .06-.06 .01 .04 .06 .03 .04 .72 Liking to play .26 .08 .12-.01 .OO .09 .15 .03 .08 .73 Enjoyment of sport .36 .14 .09 .13-.03 -.01 .29 .03 .ll .08 Precompetjtion feelings .01 .37 .ll .35 .15 .01 .01 .07 .18-.03 Performance statistics .33 -.I5 .10 .16 .06 .18 .21 -.06 .ll .O1 Effort exerted in practice 9.10 3.5'2.252.1.3 1.70'1.501.30 1.1'61.09 1.01 Eigenvahe % Variance explained 23.9 8.9 5.9 5.6 4.5 3.9 3.4 3.1 2.9 2.7 Sources of Information - 269 which new skills are learned to judge personal sport ability, while Factor 8, peer evaluation, reflects use of evaluative feedback from teammates. Factor 9, goal achievement, reflects dependence on achievement of self-set goals as a means to determine personal competence, while Factor 10, sport attraction/enjoyrnent, indicates reliance on degree of attraction or liking for the sport as an indicator of personal competence. It should be noted that 3 of the 39 items in the questionnaire did not load highly enough on any one factor and thus were not used in the interpretation of the individual factors. In addition, none of the items loaded on more than one factor. The 10 factors accounted for 64.8% of the variance in the data. The internal consistency of the items loading highly on each factor was assessed through the use of Cronbach's alpha. Obtained coefficients for the 10 factors ranged from .74 to .90. The factor pattern weights obtained from this analysis were used to calculate 10 factor scores for each subject. These factor scores were then used as a measure of each subject's preference for each of the 10 derived sources of competence information. Group Differences in Competence Judgments The purpose of this study was to test whether there are age or gender differences in the criteria that adolescents use in judging their sport ability. To examine this issue, a 2 x 2 (Gender x Age Level) multivariate analysis of variance (MANOVA) was conducted. The dependent variables were the 10 factor scores representing subjects' preferences for particular competence information sources. The independent variables were gender and age. The two levels of the age variable were obtained by separating the entire sample into two categories. The older group (M age = 16.8 k.83) comprised predominantly high school juniors and seniors who played at the varsity level (n=305) while the younger group (M age = 15.3 k.69) included athletes who played on freshman or junior varsity teams (n=130). The results of the MANOVA revealed a nonsignificant age-level-by-gender interaction effect, Wilks' lambda = .98; F(10, 422) = .99; p<.45. However, significant main effects were found for both age level, Wilks' lambda = .95; F(10, 422) = 2.05; p<.03, and gender, Wilks' lambda = .95; F(10, 422) = 2.06; p<.03. To determine more specifically how athletes' preferences for particular competence information sources differed by age and gender, the discriminant function analysis results were examined. A minimal criterion for determining significance was set at .30. Examination of the obtained discriminant function coefficients for the age-level main effect (see Table 2) showed that the two age groups differed significantly on 4 of the 10 information sources. Specifically, the older athletes scored higher than the younger athletes on use of self-comparison/ internal information, goal achievement, and sport attractiodenjoyment. In contrast, the younger athletes showed greater dependence on peer evaluation as a means to judge their sport ability. Examination of the discriminant function coefficients for the gender main effect (see Table 3) showed that the male and female athletes differed on 6 of the 10 factor scores. Specifically, females scored higher than males on the use of self-comparisodint& information and on feedback from peers, coaches, and spectators. In contrast, male athletes scored higher on the use of competitive 270 - Horn, Glenn, and Wentzell Table 2 Age Level Differences in Competence lnformation Factor score means Competence information factor scores Younger athl. (n=130) M SD Older athl. (n=305) M SD Stand. discrim. func. coeff. Self-comparisonl internal info. Competitive outcomes Parental eval./feedback Peer comparison Spectator evaluation Coach eval./feedback Speedlease of learning Peer evaluation Goal achievement Sport attractionlenjoy. Table 3 Gender Differences in Competence lnformation Factor score means Competence information factor scores Self-comparisonlinternalinformation Competitive outcomes Parental evaluationlfeedback Peer comparison Spectator evaluation Coach evaluationlfeedback Speedlease of learning Peer evaluation Goal achievement Sport attractionlenjoyment Males M SD Females M SD Stand. discrirn. func. coeff. Sources of Information - 271 outcomes and speedlease of learning as a means of evaluating personal sport competence. Discussion The results of this study show there are significant differences between younger and older adolescents in the type of information they use to evaluate their personal sport ability. Specifically, athletes in the later high school years show greater use of self-comparison processes (skill improvement over time), internalized or self-determined performance standards (achievement of self-set goals), and internal information (e.g., prematch self-confidence,ability to motivate self, enjoyment of sport activity) to evaluate how competent they are at a particular sport. Athletes in the early high school years show a greater tendency to use evaluative feedback from peers to judge their sport ability. No age-level differences were found in regard to the other sources of competence information such as peer comparison, competitive outcomes, coach feedback, parental feedback, speedlease of learning, or spectator evaluation. These results are consistent with research and theory in the developmental literature (3,9, 19) suggesting that over the adolescent years individuals develop an internalized set of performance and behavioral standards that they can then use in subsequent situations to evaluate their performance ability. The results from this study indicate that a similar developmental progression occurs in regard to competence judgments in the sport context. The finding that younger adolescents are more dependent than older adolescents on peer evaluation is also consistent with previous research showing that dependence on parental feedback declines between the ages of 8 and 14 years while preference for coach and peer feedback increases (10). Thus it appears that young adolescents are very much oriented toward peer approval but that this dependence on peers may decrease somewhat from early to late adolescence. Again, this developmental pattern is consistent with results from the more general developmental psychology literature (3). Although the findings obtained in this study do provide support for a developmental pattern in regard to competence judgments, these findings must be interpreted with some caution. Specifically, it is important to note that age in this study was confounded with competitive level, skill ability, and years of sport experience. Thus it is certainly possible that the differences found in this study between the two age groups are not due as much to cognitive maturation as to changes represented by the level of competition (i.e., freshman/junior varsity to varsity), increase in actual skill ability, and number of years of involvement in the sport. Obviously the program structure, team climate, and coaches' behavior may change as athletes progress from freshman and junior varsity teams to varsity level teams. Such changes may in turn be responsible for, or at least interact with, maturational changes in cognitive abilities to result in the age-level differences that were observed in this study with regard to adolescents' competence judgments. Therefore the group differences found in this study cannot be totally attributed to maturation. Along these same lines, although the age-group comparisons showed significant mean differences between younger and older athletes in preference for particular information sources, there was also considerable variability between 272 - Horn, Glenn, and Wentzell the athletes in each age group. Thus it is apparent that there are factors other than developmental level that have an impact on adolescents' preferences for specific information sources. Therefore, continued research is needed to investigate possible socioenvironmentalfactors (e.g., parental behaviors, program structure, coaching philosophies and behaviors) that may be more important than age in explaining why children become more or less dependent on selected sources of competence information. In regard to gender differences, the results of this study do indicate that male and female adolescents differ somewhat in the criteria they use to evaluate their sport performance. Specifically,males are more reliant on the use of competitive outcomes (winfloss and performance statistics) and speed or ease of learning new skills while females show greater preference for self-comparison and internal information and for evaluative feedback from significant others in the sport environment. In general, the fact that gender differences in preferences for competence information sources were found in this study but not in two previous studies conducted with younger children (10, 12) is consistent with research in the developmental psychology literature (14, 15, 16) showing that gender differences in many psychological variables may not emerge until adolescence. Although the reasons for such age-by-gender interactions are not yet known, it can be speculated that the sociocultural environment changes for females as they reach puberty. Such changes can affect the way female athletes perceive sport and their position in it. Whatever the explanation for the observed differences between male and female athletes, the specific differences obtained in this study are consistent with the results found in related sport research studies. Gill (8) and Duda (4, 5), in their work on competitive orientation and goal achievement orientation, have generally found that male high school and college athletes are more apt to emphasize competitive outcomes (winfloss records) and peer comparison while females are more oriented toward task mastery and goal achievement. The results of this study also showed that females are more sensitive to or more likely than males to use such internal information as degree of self-confidence, self-motivation, and positive postactivity feelings to judge their performance abilities. Again, the specific reasons for such gender differences are unknown but may well be due to sociocultural tenets that allow or even require females to be more expressive and/or sensitive than males regarding emotional states. An unanticipated finding in this study was that females showed greater use of evaluative feedback from a variety of individuals in the sport setting. Although unexpected, these results are consistent with other data we have recently collected examining high school athletes' preferences for particular coaching behaviors (20). Our preliminary analysis of these data indicates that high school female athletes show significantly greater preference than males for coaches who provide frequent reinforcement, praise, and social support. In comparison, high school male athletes are more comfortable than females with coaches who provide no feedback in response to performance successes or errors. The value that female interscholastic athletes place on feedback from others may be due to the fact that females tend to be more affiliative than males. Alternatively, as mentioned earlier, the sport environment may be different for Sources of tnformat1.m - 273 males than for females. Specifically, based on research in academic contexts (I), it could be hypothesized that females receive less contingent and performanceoriented feedback from teachers, coaches, and parents throughout the youth sport years. Thus, as adolescents they may place a greater value on feedback and prefer more of it than their male peers. In summary, the results of this study do show that the criteria that adolescents use to evaluate their sport ability vary as a function of age level and gender. However, it is also apparent that many other factors influence adolescents' selfevaluation. In research with younger athletes ages 8-14 years, Horn and Hasbrook (1 1) found that certain psychological characteristics such as level of perceived competence or perceived performance control could explain a significant amount of the variation within specific age groups in subjects' preferences for particular sources of competence information. It is certainly likely that similar results may be found with adolescent athletes. That is, perhaps such things as the athlete's level of trait anxiety, sex-role orientation, and locus of control along with other psychological characteristics also have an impact on her or his preferences for particular competence information sources. In addition, as noted earlier, it could be expected that such things as program structure, coaches' behavior, and general team climate may also affect the way in which individual athletes judge their sport ability. Thus, continued research in this area is certainly recommended. From a more practical or applied perspective, the results of this type of research indicate that children and adolescents differ in the information they use to judge their ability in sport situations. Thus, interested adults who want to facilitate a child's perception of competence must know exactly what information or criteria that child is using to judge her or his performance. Armed with such knowledge, the adult will be better able to structure the sport environment in ways that will facilitate the child's perceived competence than if it is assumed that all children are affected in the same way. The results of this study provide some understanding about the criteria that are important to various adolescent groups. This information should be used by practitioners in their attempt to provide an optimal sport environment for all children. References 1. American Association of University Women. How Schools Shortchange Girls. Wash- ington, DC: Author, 1992. 2. Ames, C., and J. Archer. Achievement goals in the classroom: Students' learning strategies and motivation processes. J . Ed. Psych. 80:260-267, 1988. 3. Adams, J.F. Understanding adolescents. In: Understanding Adolescence: Current Developments in Adolescent Psychology, J.F. Adams (Ed.). Boston: Allyn & Bacon, 1980, pp. 2-29. 4. Duda, J. 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Med. 50:46-56, 1988. 16. Phillips, D. The illusion of incompetence among academically competent children. Child Devel. 55:2000-2016, 1984. 17. Stipek, D., and D. MacIver. Developmental change in children's assessment of intellectual competence. Child Devel. 60521-538, 1989. 18. Vealey, R.S., and J.L. Campbell. Achievement goals of adolescent figure skaters: Impact on self-confidence, anxiety, and performance. J. Adol. Res. 3:227-243, 1988. 19. Veroff, J. Social comparison and the development of achievement motivation. In: Achievement-Related Motives in Children, C.P. Smith (Ed.). New York: Russell Sage Foundation, 1969, pp. 46-101. 20. Wentzell, A.B., and T.S. Horn. Leadership style preferences in high school athletes: Relationships with athletes' gender and sport self-confidence. Unpublished manuscript, Miami University, 1993.
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