Book excerpt: This book offers a new and promising way to support adults in Adult Basic Education (ABE) and English for speakers of other languages (ESOL) programs specifically, and learners in adult education, in general. Applying renowned Harvard University psychologist Robert Kegan's constructive-development theory, Drago-Severson depicts an in-depth investigation into how and why adults develop "ways of knowing" to better prepare them for their work in the 21st century. This book provides practical suggestions for applying Kegan's theory in adult education classrooms to enable teachers, curriculum developers, program designers, and policymakers to better respond to adult learners' strengths and learning needs.