This article provides a comprehensive overview of new usage models supported by the Intel® Threading Building Blocks (Intel® TBB) task scheduler, with an accent on the features facilitating construction of highly composable parallel solutions. We also discuss design decision tradeoffs, and explain implementation details that influence the performance and behavior of Intel® TBB based applications. This article may be of value both to application developers already using or intending to start using the library, by explaining its new functionality, and to researchers and engineers working on other parallelization solutions, by evaluating factors that influence design decisions in this field.