Multiblock Structured Algorithm (MSA) and in particular discusses its application in Parallel Computational Fluid Dynamics. From an aerodynamicist viewpoint, some of the main problems of MSA parallel implementation are underlined. It is highlighted, in particular, how aerodynamic requirements can often be in conflict with choices ruled by optimum parallel performance. The chapter provides a major distinction between domain decomposition technique (DDT) and the MSA. It defines DDT as the parallelization obtained by a simple data re-arrangement without affecting the numerical algorithm. If you want essay related topic you can take online essay writing service help through custom essay writing service before the exam.