The rapid change of Indonesian banking industry mode competition in banking sector become tighter. One of company?s strategies to face this competition was by developing cross functional team, which team was the key success for a company. Companies built and managed teams to carry out company?s strategy. Team building has not detached from individual building that purpose to increase performance of team member (employees) and finally can give the best contribution for their team and company. One of banks that implement this strategy was Bank Mandiri that constituted one of the biggest banks in Indonesia and has get many achievements in banking sector. Bank Mandiri?s performance has not detached from good employee?s performance that working inside. Therefore, the purpose of this research was to analyzed team building implementation, analyzed employee?s performance and analyzed correlation between team building implementation with employee?s performance of Bank Mandiri branch office Imam Bonjol. his research used quantitative approach because used theory as gu
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research activities. Type of this research was explanative research, because has purpose to explained correlation between team building implementation with employee?s performance of Bank Mandiri branch office Imam Bonjol. Data collected by field study and literature study. Field study used survey method with interview and questionnaires as instrument of research. Literature study used literatures that related to this research. Sample selected by using total sampling for 34 respondents. Technique analysis data used Spearman?s Rho Correlation to found strength of correlation between team building implementation with employee?s performance of Bank Mandiri branch office Imam Bonjol. he result of this research showed that Bank Mandiri branch office Imam Bonjol
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has good team building implementation and employee?s performance. With used spearman?s Rho Correlation method, this research found not strong enough positive correlation between team building implementation with employee?s performance of Bank Mandiri branch office Imam Bonjol. It has means; team building implementation can influence employee performance in Bank Mandiri branch office Imam Bonjol. Researcher suggested that Bank Mandiri branch office Imam Bonjol increase quality of team building implementation process.