This book is a companion volume to Engage: A Theological Field Education Toolkit (2017) and Mentoring: A Toolkit for Supervisor-Mentors in Theological Field Education (forthcoming). Both books provide tools that aim to help students engage in their formational learning through integrating theories and practices (Engage) or to support supervisor-mentors nurture practical wisdom in guiding students' journey in formational learning (Mentoring). This book is not a toolkit; it is a textbook on selected key learning theories or models that widen and deepen students' engagement and supervisor-mentors' mentoring. Its target audience, accordingly, is both students and supervisor-mentors.