When it comes to generating retirement income, investors arguably spend the most time and effort on selecting "good" investment funds/managers—the so called alpha decision—as well as the asset allocation, or beta, decision. However, alpha and beta are just two elements of a myriad of important financial planning decisions for the average investor, many of which can have a far more significant impact on retirement income. We present a concept that we call "Gamma" designed to quantify the additional value that can be achieved by an individual investor from making more intelligent financial planning decisions.