Recently the application of Bayesian statistical procedures within the field of guidance and counseling has been receiving attention. This paper justifies and illustrates a simple, direct application of Bayes' Formula to expectancy tables. To make the application a counselor must specify prior probabilities that a student will attain success (defined appropriately). He may then take the probabilities within the expectancy table as likelihoods, apply Bayes' formula and obtain a posterior distribution of success for that student. This procedure allows a counselor the advantage of bringing to bear his personal knowledge of those students with whom he works. It will enable him to consider such diverse things as whether a student is an over-achiever, has just recovered from an extended illness or even the fact that there was a death in the student's family recently. Hopefully, the method will allow counselors to better aid their clients. A complete example demonstrating the application is included. (Author)