Factors Affecting Teamwork Effectiveness of Employees at Toshin International Corporation Co., Ltd.

This study aimed to 1) study the factors of team composition of employees, 2) study the effectiveness of teamwork, 3) compare the effectiveness of teamwork of employees classified by personal data, and 4) study the factors of team composition that affect the effectiveness of teamwork of employees of Toshin International Corporation Co., Ltd.The population used in this study comprised 150 employees at the company.The sample size was calculated according to the Taro Yamane's formula (Yamane, 1967), resulting in 90 samples.Data were collected using a questionnaire and analyzed using descriptive statistics, including percentages, means, and standard deviations, as well as hypothesis testing using t-test, F-test (One-Way ANOVA) and multiple regression analyses were performed.The results of the study found that most respondents were male, aged 25-35 years, single, had an education level lower than a bachelor's degree, had worked for 1-6 years, and held most employee positions.In addition, team composition factors (environment, composition and characteristics, work design, and work process) were highly important.While teamwork effectiveness (production, efficiency, satisfaction, development, and adjustment)Overall, the teamwork effectiveness of employees with different personal data was not significantly different at the 0.05 level.In addition, the four team composition factors also had a statistically significant effect on the teamwork effectiveness of employees at the level of 0.05.Recommendations: Continuous review and development of work processes should be conducted, especially in terms of organizing team composition to be appropriate for the knowledge and skills of members, promoting work design that allows members to use their full potential, creating an atmosphere and environment conducive to working together, and emphasizing communication and setting clear team goals to develop cooperation and increase teamwork effectiveness sustainably.