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Relative Age Effect (RAE) refers to the difference between the individuals who were born in the early or the later period of the same year. The purpose of this study was to investigate the existence and prevalence of RAE in Turkish Soccer. The data were collected from 3074 (530 professional players and 2544 amateur players) active players who play for eight different age categories of 19 soccer clubs in Turkish First Soccer League. The significance of the distributions by birth month, distributions by quarter-year and the differences between groups were analyzed through chi-square test. For all categories, first month (January%=22.10), and first quarter (Q1%=44.44) of distributions by birth month and were found to be significantly high (p<0.01). The researchers observed the existence and prevalence of RAE in youth and professional teams of Turkish Soccer Clubs. Trainers should evaluate players carefully during talent selection, in order to eliminate this unfair competition.

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166 football coaches in the province of Mugla, who participated in the 2014 Mugla SitkiKocman University,Turkish Football Federation (TFF), Turkish Football Coaches Association (TFCA) regional development Seminar organized by TFCA every two years and voluntarily participated in the present research form the research sample.Self-Leadership Questionnaire-SLQ developed by Anderson and Prussia (1997), and personal information form prepared in accordance with the purpose of the present research were used as data collection tools in the research. Significant differences tests were used to test whether selfleadership attitudes of coaches differ in terms of license levels, length of service and professional satisfaction levels. According to the findings of the present research; self-leadership characteristics of football coaches are higher than the average, and there is no significant difference between the self-leadership attitudes of football coaches in terms of license levels (p>0.005), while there is a significant difference in terms of length of service (p<0.005). Accordingly, football coaches with longer experience have higher self-leadership attitudes compared to other coaches.