This will be a report on a method developed recently that applies a comprehensive set of quantitative criteria on an orbit correction system to evaluate its performance in almost all aspects. Based entirely on analytical formulation, the method can answer questions more efficiently and rigorously than simulation, as well as offer more insight. Complementary methods on optimization, failure mode and critical element studies will also be presented. Application to various systems will be discussed. This is not an overview or survey talk and I will get into the nitty-gritty detail to some extent