Introduction: The assignment-based approach is an educational strategy that emphasizes learning by doing tasks. In this approach, the learner learns how to act in different situations, and this approach teaches skills that are similar to the tasks that the learner encounters in the real world and in practice. Therefore, the purpose of this study was to design an optimal assignment-based curriculum model for nursing masters students based on Akker model. Methods: This research was a qualitative study. It was based on the interpretive model and the content analysis method was used. 5 volumes of books were selected as statistical sample. The research tool was Shanon Entropy, which presents data processing in the context of content analysis in a new and quantitative way. The extracted components were analyzed by Shannon entropy content analysis method. In order to complete the design of the proposed model, a semi-structured interview was conducted on 12 nursing education and training specialists in 1997 and the proposed model was designed based on Acker's ten elements for master's degree in nursing. Results: According to the research findings on the peculiarities and characteristics of the teaching materials element, the most important components of the task-based curriculum design included: being diverse and engaging, well-equipped laboratories, tailored to the needs of learners, integrated, purposeful, applied and Practical, Interactive Textbooks, Workshops, Clinical Skills Unit, Projects, Better Learning, Flowcharts, Clinical Experiences, Simulations, Theory and Practice, Communication Training, Writing Assignments, Tutorials, Targeted, Integrated, Approach The Pedagogical Reflection of Community Realities, Ability to Use New Materials and Resources, and use of images. Conclusions: In order to design the suggested task-based curriculum model, the Aker model was used. Based on the findings of the present study, it can be concluded that students can achieve sustainable and lifelong learning by integrating their findings, transfer and generalization into the environment, so that they can play a role. Implement yourself as one of the human resources involved in human well-being in the workplace. Therefore, it is suggested that the needs of learners and the real needs of the community be identified and empowered by conducting training courses for clinical teachers and empowering curriculum specialists in designing practical assignments and utilizing the curricula of leading universities in curriculum use. The task-centered attention should be taken into consideration.