As an employer, there is no guarantee that any exact termination procedure will free you from wrongful discharge liability claims.
However, a continuous, proactive application of both well-articulated, updated policies for personnel, well-documented interactions with failing personnel, and the thoroughly articulated business-based reasons for terminations are key elements of a best-possible defense. See also, “Employee Terminations; Firing Low-Performing Workers While Limiting Repercussions.”