Studi ini memberikan kontribusi kepada dunia akademis khususnya di bidang pembuatan keputusan stratejik. Temuan penelitian tentang hubungan TMT Trust dan TMT Collaboration terhadap pengambilan keputusan secara komprehensif baik proses dan pembahasan isi (Content) akan memperkaya literatur bagaimana meningkatkan kinerja organisasi dengan melakukan proses pengambilan keputusan yang optimal dan efektif. Kontribusi manajerial dihasilkan dari model proses pengambilan keputusan stratejik yang optimal yang dapat diterapkan di perusahaan untuk meningkatkan kinerja organisasi. ...... One of the most important roles of top management in the organization is how effective the strategic decision they make. The strategic decision will determine the competitiveness of the company in the industry. It is widely known that trust and collaboration of Top Management Team (TMT) generates positive impacts in the strategic decision making process. It is also known that rational process determines the effectiveness of decision that been made by TMT. The aim of this research is to study the relations between TMT?s trust and collaboration toward rational comprehensive on strategic decision making process. An empirical study has been undertaken to develop a model on how to make the effective strategic decision making process for mining companies. This study utilizes Structural Equation Model (SEM) Lisrel methodology to analyze 267(two-hundred and sixty-seven) respondents representing mining companies in Indonesia. This study has found that TMT collaboration being a mediator of TMT trust to rational strategic decision making. To develop an effective strategic decision making process, TMT must possess a high trust and collaboration, as well as a high process and content comprehensiveness. This study contributes to existing literature on strategic management, especially the strategic decision making. The finding generated from TMT trust and collaboration relation to comprehensiveness process and content will certainly enrich the literature on how to improve organizational performance by means of conducting optimal and effective strategic decision making process. The insight produced from this study will provide managerial advise by proposing an optimal model of strategic decision making process that could boost company performance.