The contemporary research landscape is a collaborative and international enterprise requiring high level coordination among multi-disciplinary, cross-cultural teams. As such, the Accelerating Research through International Network-to-Network Collaborations program (AccelNet) values cooperation over competition. Program goals are to 1) leverage prior NSF support for building research capacity towards activities that launch international research network of networks (NoN) that will lead to an accelerated advancement of an area of science after the award period and 2) recruit and foster a diverse and internationally competent US-based workforce trained in conducting and leading multi-team international collaboration. Any area funded by the National Science Foundation is eligible, particularly those addressing grand research challenges identified within research communities and/or by NSF. Successful proposals will demonstrate that the proposed activities will: 1) accelerate scientific research at a rate that would not be possible without concerted international cooperation in research planning; 2) make NoN members more competitive for research awards following the period of award; 3) recruit and foster a US-based diverse and internationally competent workforce trained in conducting and leading multi-team international collaboration. Proposals must include detailed plans for collaborative networking activities that will result in a synergy of effort across the entire NoN. The AccelNet Program has two tracks. The Design Track allows PIs to build on prior research by providing time and resources for building capacity across teams to launch a synergistic international NoN. The Implementation Track allows PIs to build on prior research or networking activities by providing time and resources to implement an international NoN. There are two phases to the Implementation Track. Phase 1 funding is for activities related exclusively to NoN activities and is open to all PIs, including but not limited to prior successful Design Track PIs. Phase 2 funding is for early concept research arising from Phase 1 activities and is only open to Phase 1 PIs who have identified a critical research gap during synergistic networking activities in the first 18-24 months of Phase 1 awards.