Although human-centered design (HCD), or user-centered design (UCD), is a foundational approach in a wide range of fields, sometimes HCD can lead to “designed injustice”—where products or systems facilitate unjust outcomes in society. In a brand new journal article, David Pearl and I present a new method, Persona Multiplication (PM), which helps designers avoid some of the dangers implicit in traditional HCD. PM helps guide designers through an evaluation of the implicit (or potential) designed injustice early in the design process.