This book focuses on critical exchanges between leaders and followers which promote strategic change and enhance effectiveness of organisations.It covers an expanse of leadership theories which serve as foundation for our understanding of the field.However, emphasis is on the leader-member exchange(LMX) theory, an emerging leadership theory.Models on organisational effectiveness are mentioned,particularly the competing values model.Priority is given to the internal and external environmental factors that drive change in organisations, as organisations are viewed as open systems.The multidimensional concept of LMX provide an empirical basis of making organisations effective,especially LMX factors such affect, loyalty, and professional respect.Also captured is the combined factors of contribution and professional respect (two factors) of LMX accounting for change in organisations.Overall LMX predict effective work organisations and change.