In a recent paper on statistical consulting (Marquardt 1979), an operational approach called total involvement was advocated.This paper continues that discussion, but focuses on the criteria for evaluating a consultant's effectiveness, whatever the operational approach.A related goal is to characterize sources of data to evaluate performance.Interrelationships with the consulting environment and the evaluation viewpoint are explored.The total involvement approach is found to produce not only maximum consulting effectiveness, but also a clear definition of what is expected of a statistical consultant, and a wealth of performance evaluation data as by-products.