Move By The Left Flank is intended for use as a supplementary textbook in a course on advanced systems engineering. The book covers concepts of Technical Leadership, System Complexity, Systems-of-systems, and the impact on traditional system engineering from distributed, digitally rich, complex systems. A new approach to technical leadership suitable for these Information Revolution systems is proposed, one that involves the use of vision as a guide to technical leadership. Suitably adjusted approaches are offered for technical planning, product transition, verification and validation, project organization, and requirements development. The text is supplemented with twelve case studies covering complex system design, development, test and operation, largely drawn from the author's 40 years of high level system engineering experience.