This study aims to improve team effectiveness in the digital marketing division at PT. SMI-PB. This type of research is action research. The sample used a purposive sampling technique due to the special criteria applied in the sampling process. There were fourteen employees of the digital marketing division as samples for this study. Team effectiveness was measured using a questionnaire, interview, and observation. Five dysfunctions of a team by Lencioni which are the absence of trust, fear of conflict, lack of commitment, avoidance of accountability and inattention to results with validity and reliability values of ? = 0.894, were used as measuring instrument for the questionnaire which consisted of 38 items. The data analyzed with the Microsoft Excel program according to the calculation by Lencioni. The results showed four aspects that are in the medium category, namely trust, commitment, accountability, and result. The conflict aspect is the only one in the high category. Profoundly, the accountability aspect with the average score of 3.31 needs to be considered in the development program by providing 'Team Building Training Intervention'.