summarize the key points of the paper:Levitt, Peggy and B. Nadya Jaworsky. 2007. "Transnational Migration Studies: Past Developments and Future Trends." Annual. Review. Sociol. 33:129-56.

In their 2007 paper "Transnational Migration Studies: Past Developments and Future Trends," Levitt and Jaworsky analyze the evolution of transnational migration studies and outline future directions for research in this area. Key points include: 1. **Definition and Scope**: The authors define transnational migration as processes that extend beyond borders and include multiple connections between individuals and their home and host countries. They emphasize the importance of understanding migration as a multidimensional phenomenon that involves social, economic, and political elements. 2. **Historical Context**: The paper reviews the development of transnational migration studies, highlighting how the field has transitioned from a focus on assimilation and integration to a broader understanding of migrants' ongoing ties to their countries of origin. 3. **Theoretical Frameworks**: Levitt and Jaworsky discuss various theoretical approaches that have informed transnational migration literature, including social network theory, globalization, and transnationalism, suggesting that each offers valuable insights into understanding migrant experiences. 4. **Empirical Research**: The authors reflect on significant empirical studies that have shaped the field, noting patterns in migration practices, the complexity of identities among migrants, and the impacts of transnational ties on both home and host communities. 5. **Future Trends**: The paper identifies important areas for future research, such as the need to investigate the interplay between local and global factors in migration processes, the role of technology in facilitating transnational connections, and the impact of policy on migrant experiences. 6. **Calling for Inclusivity**: Levitt and Jaworsky argue for a more inclusive approach to transnational research that considers diverse migrant experiences and the varied contexts in which migration occurs. Overall, the paper provides a comprehensive overview of the field's past developments while advocating for new avenues of inquiry to deepen the understanding of transnational migration dynamics.