The field of highly frustrated magnetism has developed considerably and expanded over the last
15 years. Issuing from canonical geometric frustration of interactions it now extends over
other aspects with many degrees of freedom such as magneto-elastic couplings orbital degrees
of freedom dilution effects and electron doping. Its is thus shown here that the concept of
frustration impacts on many other fields in physics than magnetism. This book represents a
state-of-the-art review aimed at a broad audience with tutorial chapters and more topical ones
encompassing solid-state chemistry experimental and theoretical physics.