LAPACK is designed to give high efficiency on vector processors, high-performance ``super-scalar'' workstations, and shared memory multiprocessors. It can also be used satisfactorily on all types of scalar machines (PC's, workstations, mainframes). A distributed-memory version of LAPACK, ScaLAPACK[17], has been developed for other types of parallel architectures (for example, massively parallel SIMD machines, or distributed memory machines). See Chapter 3 for some examples of the performance achieved by LAPACK routines.