Although target-date retirement funds are a ubiquitous retirement planning tool, their glide paths vary considerably from one provider to the next. Moreover, the glide paths themselves tend to change over time. Thomas M. Idzorek, CFA, discusses the problems associated with benchmarking these instruments and outlines a glide path stability score.

The Take 15 Series is a series of short interviews with leading practitioners on timely topics focused on the investment profession.