2. The development of a strengthened by the character of self-confidence in this research was developed by reverse translation (Back translation) the nature of the character, the strength of self-confidence in Thailand's athletes. Join sporting university. The Northeast at 38 December 2557 of between 20-26 months, 320 people (160 men, 160 women and men) with the experts in psychology, sports psychology, sports Doctoral degrees in 2 patients and professionals. The English have a PhD in English of two people by a specialist foreigners in English, with a PhD in English number one, to analyze and review the terms of the measure is strengthened by his character. self-confidence It shows the quality of the content validity (Content Validity) of the questionnaire.
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