Selecting a Non-symmetric Driver

Several drivers may be used to solve the same problem. However, one driver may converge faster or may be easier to modify than the other depending on the nature of the application. The decision of what to use should be based on the type of problem to be solved and the part of the spectrum that is of interest. See  3.2 of Chapter 3 for more discussion on the issues that should be considered when deciding to use a spectral transformation.