I am currently reading "Rethinking the Fifth Discipline" by Bob Flood, and find it to be a very easy and interesting read. I encourage System Thinkers to read this book after they have read Senge's original Fifth Disciple off course.

I am also going to soon start reading M.C. Jackson's Creative Holism for Managers. It is the most up to date all in one book on Organisational Systems Theory and Systems Thinking.