Working with SDI, Third Edition: A manual for developing relationship intelligence Paperback – March 16, 2026

A Manual for Developing Relationship IntelligenceWhy do some people click while others clash? Why can a strength be effective in one situation and counterproductive in another? How can greater clarity about motives and conflict support more productive collaboration?In this expanded third edition of Working with SDI, Tim Scudder, PhD, provides a practical guide to understanding the motives that drive individual behavior in relationships.Based on the pioneering work of Dr. Elias Porter, the Strength Deployment Inventory (SDI) is more than a personality test. It is a research-based system for understanding motives and how strengths—when overused—can unintentionally limit effectiveness. This book explains the theory behind the SDI and its everyday implications at work and at home.Working with SDI is a practical guide that explores the core concepts behind SDI results, including Motivational Value Systems, Conflict Sequences, Strengths, and Overdone Strengths. Readers are encouraged to focus on the sections most relevant to their own personalities and the numerous tips for improving meetings, messages, and conversations.This book also serves as an authoritative technical reference for facilitators, coaches, and researchers. It includes clear explanations of SDI theory, history, and psychometric properties.Readers gain access to:Insight into the motives that drive behavior in relationships.A summary of the research supporting the SDI.Practical guidance for interpreting SDI results accurately.The history and development of the SDI.Examples that support communication, learning, facilitation, and coaching.Whether you are navigating a difficult conversation at home or supporting collaboration within a team or organization, this book helps you understand the SDI and apply its concepts in daily interactions. Read more