Tennis officials play a significant role in tennis matches, but a shortage in the number of tennis officials is a problem in Japan. Despite this, little study has been done to increase their commitment in the tennis industry. The purpose of this study was to examine the degree to which the motivation and satisfaction Japanese tennis officials is related to the frequency of their officiation. This study was conducted from October 2017 to April 2018, and the questionnaires consisted of demographic items, Motivation and Satisfaction Inventory of Tennis Officials (MSI-TO Scale), and free comments regarding their working conditions. A total of 1,580 questionnaires were distributed via prefectural tennis association to the officials who had registered with the Japan Tennis Association (JTA); 297 questionnaires were returned later for analysis. As for the analysis of the demographic items and the MSI-TO scale, simple tabulation and cross tabulation were carried out at a significance level of 5％， and a mixed analysis of Text Mining (TM) and qualitative analysis was carried out on the free comments regarding working conditions. The main results were the following. 1) Satisfaction with social contribution through officiating was low, and this was considered to be related to a decrease in the frequency of officiation. 2) High motivation and satisfaction regarding self-growth and social interaction may be related to an increase in frequency of officiation. 3) As a result of the qualitative analysis of free comments regarding working conditions, three areas of desired improvement were identified: treatment, environment, and officiating education. The reliability of this analysis was reinforced by TM.

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Tennis officials play a significant role in tennis matches, but a shortage in the number of tennis officials is a problem in Japan. Despite this, little study has been done to increase their commitment in the tennis industry. The purpose of this study was to examine the degree to which the motivation and satisfaction Japanese tennis officials is related to the frequency of their officiation. This study was conducted from October 2017 to April 2018, and the questionnaires consisted of demographic items, Motivation and Satisfaction Inventory of Tennis Officials (MSI-TO Scale), and free comments regarding their working conditions. A total of 1,580 questionnaires were distributed via prefectural tennis association to the officials who had registered with the Japan Tennis Association (JTA); 297 questionnaires were returned later for analysis. As for the analysis of the demographic items and the MSI-TO scale, simple tabulation and cross tabulation were carried out at a significance level of 5％， and a mixed analysis of Text Mining (TM) and qualitative analysis was carried out on the free comments regarding working conditions. The main results were the following. 1) Satisfaction with social contribution through officiating was low, and this was considered to be related to a decrease in the frequency of officiation. 2) High motivation and satisfaction regarding self-growth and social interaction may be related to an increase in frequency of officiation. 3) As a result of the qualitative analysis of free comments regarding working conditions, three areas of desired improvement were identified: treatment, environment, and officiating education. The reliability of this analysis was reinforced by TM.

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