A systematic method is given for selection of the set point weighting parameter(b)in PI/PID controllers for unstable first-order plus time delay systems. The method is based on minimizing the integral square error(ISE)for a servo problem. The present work also extends the method ofChidambaram(2000a, b)by minimizing overshoot for the cases of damping coefficient,zeta>1 andzeta=1. The responses of PID controllers without and with the set point weighting are compared. Simulation results are also given for an FOPTD transfer function system, for a higher order transfer function model, and on a nonlinear chemical reactor problem. The present method gives an improved performance.