The potential of Universal Design for Learning (UDL) has captured the imagination of policy makers, educators, administrators, teacher educators, as well as educational researchers. Over the past 20 years, there has been increasing interest in how the vision of UDL could be translated into practice. And yet, there is little agreement about whether or not UDL is a design intervention and therefore the responsibility of publishers and instructional designers as they create curricula and instructional materials. I am pleased to introduce this guest column that profiles the work of Drs. Matthew Marino and Eleazar Vasquez as they describe the relationship between executive functioning and learner variability in inclusive classrooms.