Systems-centred theory is one of the most important development in group-analytic thinking in the last 40 years. In this book Yvonne Agazarian, who has contributed significantly to its development, traces the evolution of her ideas and their application to create a meta-theory of living human systems. This book follows Agazarian as she creates SAVI (system for analyzing verbal interaction) with Anita Simon, the theory of the invisible group and group-as-a-whole theory. at the forefront of theoretical developments, she joined the General Systems Committee during which she began to apply systems theory to practice and develop systems-centred training techniques. she shows how, by integrating theories, she was able to arrive at her theory of living human systems. this account of her professional life not only documents major developments in groups analysis, it also shows a theory is formulated from intellectual and personal contexts.