With uniprocessors running out of steam, parallel architectures provide a realistic path towards scalable performance. Nevertheless, shared-memory multiprocessors are limited by the difficulty of writing correct and fast parallel programs. Transactional Coherence and Consistency (TCC) is a new model for shared memory systems that builds upon transactional memory. In TCC, user-defined transactions are the basic unit of parallelism, coherence and consistency, error atomicity, and optimization. TCC simplifies parallel programming by eliminating the need for manual orchestration of parallelism using locks. It also provides a smooth transition from sequential to parallel programs. This talk will introduce the software and hardware aspects of TCC and provide an overview of recent research developments in the TCC project.