In addition to convergence, a second significant pattern of organizational activity has been occurring. The past few decades have seen a proliferation of new hybrid organizational models formed to address a variety of societal challenges. These organizations consciously blend attributes and strategies from all sectors and thus resist easy classification within the boundaries of the three traditional sectors. But they share two common characteristics-—pursuit of social aims and the use of business methods that position them within the landscape of the emerging fourth sector. The following are examples of hybrid models that have emerged in recent years. Many of these terms define overlapping activities, reflecting the state of fragmentation in which the emerging landscape finds itself today.