Objective: Today, inter-organizational cooperation such as strategic partnerships and joint ventures are among the most important business management tools to improve the competitiveness of organizations, especially in complex and chaotic environments. Methodology: This study aimed to determine the relationships between partners' selection criteria in inter-organizational strategic cooperation in the IT industry of Iran. The study sample is IT managers and experts of Tehran. Research made questionnaire was used for data collection and using the Delphi technique and fuzzy DEMATEL, data were analyzed; the research findings show that partners having criterion of complementary resources, partners having criterion of specific advantages in the activity field and tangible assets having criterion such as intangible assets are the main criteria. Results: The technology and innovation ability having criterion in the joint venture field, having the good market share in the industry, having the work experience in the field of partners activity, having the special technical capabilities and a willingness to share their expertise are the core criterion. Similarity criterion of cooperation companies in terms of big and having criterion of distribution channels is also the independent criteria. Conclusion: The research results showed that having special technical capabilities that help partners, have a particular importance for organizations that tend to have inter-organizational cooperation. Therefore, it is recommended that organizations that lack these important factors or are in low level strengthen their technical capabilities to be able to have inter-organizational cooperation with influential organizations.
